explicitly downcast

Tools like "sparse" check for missing downcasts, since implicit cast
may be dangerous.  Although that does not change the compiler result,
it may make the code more readable (IMHO), because you always see when
there may be data cut off.

git-svn-id: https://svn.musicpd.org/mpd/trunk@7196 09075e82-0dd4-0310-85a5-a0d7c8717e4f

src/audioOutputs/audioOutput_alsa.c

@@ -215,7 +215,7 @@ configure_hw:
 		      snd_strerror(-err));
 		goto fail;
 	}
-	audioFormat->channels = channels;
+	audioFormat->channels = (mpd_sint8)channels;
 
 	err = snd_pcm_hw_params_set_rate_near(ad->pcmHandle, hwparams,
 					      &sampleRate, NULL);

src/audioOutputs/audioOutput_oss.c

@@ -485,9 +485,9 @@ static int oss_openDevice(AudioOutput * audioOutput)
 	OssData *od = audioOutput->data;
 	AudioFormat *audioFormat = &audioOutput->outAudioFormat;
 
-	od->channels = audioFormat->channels;
+	od->channels = (mpd_sint8)audioFormat->channels;
 	od->sampleRate = audioFormat->sampleRate;
-	od->bits = audioFormat->bits;
+	od->bits = (mpd_sint8)audioFormat->bits;
 
 	if ((ret = oss_open(audioOutput)) < 0)
 		return ret;