changed the way to collect supported samplerate range

src/host/coreaudio/macos/mod.rs

@@ -300,19 +300,15 @@ impl Device {
             let buffer_size = get_io_buffer_frame_size_range(&audio_unit)?;
 
             // Collect the supported formats for the device.
-            let mut fmts = vec![];
-            for range in ranges {
                 let fmt = SupportedStreamConfigRange {
                     channels: n_channels as ChannelCount,
-                    min_sample_rate: SampleRate(range.mMinimum as _),
-                    max_sample_rate: SampleRate(range.mMaximum as _),
+                min_sample_rate: SampleRate(ranges.iter().map(|v| v.mMinimum as u32).min().unwrap()),
+                max_sample_rate: SampleRate(ranges.iter().map(|v| v.mMaximum as u32).max().unwrap()),
                     buffer_size,
                     sample_format,
                 };
-                fmts.push(fmt);
-            }
 
-            Ok(fmts.into_iter())
+            Ok(vec![fmt].into_iter())
         }
     }