Remove doc(cfg()) from expressions

warning: unused doc comment
       --> gstreamer-video/src/video_info.rs:655:37
        |
    655 |           #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_12")))]
        |                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    656 | /         {
    657 | |             VideoInfoBuilder {
    658 | |                 format,
    659 | |                 width,
    ...   |
    674 | |             }
    675 | |         }
        | |_________- rustdoc does not generate documentation for expressions

Also simplify some blocks into expressions which are allowed to have
attributes as well since Rust 1.43.

gstreamer-base/src/subclass/aggregator.rs

@@ -761,7 +761,6 @@ where
         klass.fixate_src_caps = Some(aggregator_fixate_src_caps::<T>);
         klass.negotiated_src_caps = Some(aggregator_negotiated_src_caps::<T>);
         #[cfg(any(feature = "v1_18", feature = "dox"))]
-        #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
         {
             klass.sink_event_pre_queue = Some(aggregator_sink_event_pre_queue::<T>);
             klass.sink_query_pre_queue = Some(aggregator_sink_query_pre_queue::<T>);

gstreamer-video/src/video_info.rs

@@ -346,10 +346,7 @@ impl fmt::Debug for VideoInfo {
             .field("multiview_flags", &self.multiview_flags());
 
         #[cfg(any(feature = "v1_12", feature = "dox"))]
-        #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_12")))]
-        {
         b.field("field_order", &self.field_order());
-        };
 
         b.finish()
     }
@@ -520,13 +517,10 @@ impl<'a> VideoInfoBuilder<'a> {
             }
 
             #[cfg(any(feature = "v1_12", feature = "dox"))]
-            #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_12")))]
-            {
             if let Some(field_order) = self.field_order {
                 let ptr = &mut info.ABI._gst_reserved as *mut _ as *mut i32;
                 ptr::write(ptr.offset(2), field_order.to_glib());
             }
-            }
 
             Ok(VideoInfo(info))
         }
@@ -631,7 +625,6 @@ impl VideoInfo {
         assert_initialized_main_thread!();
 
         #[cfg(not(any(feature = "v1_12", feature = "dox")))]
-        #[cfg_attr(feature = "dox", doc(cfg(not(feature = "v1_12"))))]
         {
             VideoInfoBuilder {
                 format,
@@ -652,7 +645,6 @@ impl VideoInfo {
             }
         }
         #[cfg(any(feature = "v1_12", feature = "dox"))]
-        #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_12")))]
         {
             VideoInfoBuilder {
                 format,

gstreamer/src/event.rs

@@ -1327,12 +1327,9 @@ impl<'a> StreamStartBuilder<'a> {
         }
 
         #[cfg(any(feature = "v1_10", feature = "dox"))]
-        #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_10")))]
-        {
         if let Some(ref stream) = s.stream {
             gst_sys::gst_event_set_stream(ev, stream.to_glib_none().0);
         }
-        }
 
         ev
     });
@@ -1675,14 +1672,8 @@ impl<'a> SeekBuilder<'a> {
             );
 
             #[cfg(any(feature = "v1_16", feature = "dox"))]
-            #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-            {
             if let Some(trickmode_interval) = s.trickmode_interval {
-                    gst_sys::gst_event_set_seek_trickmode_interval(
+                gst_sys::gst_event_set_seek_trickmode_interval(ev, trickmode_interval.to_glib());
-                        ev,
-                        trickmode_interval.to_glib(),
-                    );
-                }
             }
 
             ev

gstreamer/src/message.rs

@@ -1626,8 +1626,6 @@ macro_rules! message_builder_generic_impl {
                 }
 
                 #[cfg(any(feature = "v1_14", feature = "dox"))]
-                #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_14")))]
-                {
                 if !self.builder.other_fields.is_empty() {
                     let structure = gst_sys::gst_message_writable_structure(msg);
 
@@ -1639,7 +1637,6 @@ macro_rules! message_builder_generic_impl {
                         }
                     }
                 }
-                }
 
                 from_glib_full(msg)
             }
@@ -1708,7 +1705,6 @@ impl<'a, T: MessageErrorDomain> ErrorBuilder<'a, T> {
 
     message_builder_generic_impl!(|s: &mut Self, src| {
         #[cfg(any(feature = "v1_10", feature = "dox"))]
-        #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_10")))]
         {
             let details = match s.details.take() {
                 None => ptr::null_mut(),
@@ -1776,7 +1772,6 @@ impl<'a, T: MessageErrorDomain> WarningBuilder<'a, T> {
 
     message_builder_generic_impl!(|s: &mut Self, src| {
         #[cfg(any(feature = "v1_10", feature = "dox"))]
-        #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_10")))]
         {
             let details = match s.details.take() {
                 None => ptr::null_mut(),
@@ -1844,7 +1839,6 @@ impl<'a, T: MessageErrorDomain> InfoBuilder<'a, T> {
 
     message_builder_generic_impl!(|s: &mut Self, src| {
         #[cfg(any(feature = "v1_10", feature = "dox"))]
-        #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_10")))]
         {
             let details = match s.details.take() {
                 None => ptr::null_mut(),