again with feeling

ferretro_components/src/provided/sdl2/audio_thread.rs

@@ -25,7 +25,11 @@ impl AudioCallback for MySdlAudio {
         if self.must_resample {
             todo!("correct software resampling")
         }
-        self.reader.pop_slice(data);
+        let buf_len = data.len();
+        let mut remaining = buf_len;
+        while remaining > 0 {
+            remaining -= self.reader.pop_slice(&mut data[buf_len - remaining..]);
+        }
     }
 }