clean match arm

src/source/uniform.rs

@@ -61,7 +61,7 @@ where
         let frame_len = input.current_frame_len().map(|x| x.min(32768));
 
         let from_channels = match input.channels() {
-            n if n == 0 => target_channels,
+            0 => target_channels,
             n => n,
         };
         let from_sample_rate = input.sample_rate();