Fix various clippy warnings in examples

examples/src/bin/appsink.rs

@@ -67,7 +67,7 @@ fn create_pipeline() -> Result<gst::Pipeline, utils::ExampleError> {
             let sum: f64 = samples
                 .iter()
                 .map(|sample| {
-                    let f = (*sample as f64) / (i16::MAX as f64);
+                    let f = f64::from(*sample) / f64::from(i16::MAX);
                     f * f
                 })
                 .sum();

examples/src/bin/decodebin.rs

@@ -13,7 +13,7 @@ fn main() {
     let uri: &str = if args.len() == 2 {
         args[1].as_ref()
     } else {
-        panic!("Usage: decodebin file_path");
+        panic!("Usage: decodebin file_path")
     };
 
     let pipeline = gst::Pipeline::new(None);

examples/src/bin/launch.rs

@@ -21,7 +21,7 @@ fn main() {
                     println!("Failed to parse pipeline: {}", err);
                 }
 
-                process::exit(-1);
+                process::exit(-1)
             }
         };
     let bus = pipeline.get_bus().unwrap();

examples/src/bin/pad_probes.rs

@@ -37,7 +37,7 @@ fn main() {
             let sum: f64 = samples
                 .iter()
                 .map(|sample| {
-                    let f = (*sample as f64) / (i16::MAX as f64);
+                    let f = f64::from(*sample) / f64::from(i16::MAX);
                     f * f
                 })
                 .sum();

examples/src/bin/playbin.rs

@@ -13,7 +13,7 @@ fn main() {
     let uri: &str = if args.len() == 2 {
         args[1].as_ref()
     } else {
-        panic!("Usage: playbin uri");
+        panic!("Usage: playbin uri")
     };
 
     let playbin = gst::ElementFactory::make("playbin", None).unwrap();

examples/src/bin/player.rs

@@ -73,7 +73,7 @@ fn main() {
     let uri: &str = if args.len() == 2 {
         args[1].as_ref()
     } else {
-        panic!("Usage: player uri");
+        panic!("Usage: player uri")
     };
 
     match main_loop(uri) {

examples/src/bin/toc.rs

@@ -13,7 +13,7 @@ fn main() {
     let uri: &str = if args.len() == 2 {
         args[1].as_ref()
     } else {
-        panic!("Usage: toc file_path");
+        panic!("Usage: toc file_path")
     };
 
     let pipeline = gst::Pipeline::new(None);
@@ -61,7 +61,7 @@ fn main() {
         };
 
         match msg.view() {
-            MessageView::Eos(..) => break,
+            MessageView::Eos(_) | MessageView::AsyncDone(_) => break,
             MessageView::Error(err) => {
                 println!(
                     "Error from {}: {} ({:?})",
@@ -71,7 +71,6 @@ fn main() {
                 );
                 break;
             }
-            MessageView::AsyncDone(_) => break,
             MessageView::Toc(msg_toc) => {
                 let (toc, updated) = msg_toc.get_toc();
                 println!(