Fix up some integer types

gstreamer-audio/src/audio_format_info.rs

@@ -78,12 +78,12 @@ impl AudioFormatInfo {
         from_glib(self.0.endianness)
     }
 
-    pub fn width(&self) -> i32 {
-        self.0.width
+    pub fn width(&self) -> u32 {
+        self.0.width as u32
     }
 
-    pub fn depth(&self) -> i32 {
-        self.0.depth
+    pub fn depth(&self) -> u32 {
+        self.0.depth as u32
     }
 
     pub fn unpack_format(&self) -> ::AudioFormat {

gstreamer-audio/src/audio_info.rs

@@ -204,11 +204,11 @@ impl AudioInfo {
         (self.format_info().depth() as u32) >> 3
     }
 
-    pub fn depth(&self) -> i32 {
+    pub fn depth(&self) -> u32 {
         self.format_info().depth()
     }
 
-    pub fn width(&self) -> i32 {
+    pub fn width(&self) -> u32 {
         self.format_info().width()
     }