* Fix wrongly triggered error messages about OpenAL audio contexts

(The error state simply wasn't cleared before calling a function that could produce an error)

Patch by vs2k5

git-svn-id: svn+ssh://svn.gna.org/svn/warzone/trunk@1803 4a71c877-e1ca-e34f-864e-861f7616d084

lib/sound/openal_track.c

@@ -202,11 +202,17 @@ void sound_Update( void )
 //	}//  <=== whats up with this You trying to make those local only ??
 
 	cdAudio_Update();
+
+	// Reset the current error state
+	alcGetError(device);
+
 	alcProcessContext(context);
+
 	err = alcGetError(device);
-	if(err != ALC_NO_ERROR) {
+	if (err != ALC_NO_ERROR)
+	{
 		debug(LOG_ERROR, "Error while processing audio context: %s",
-				alGetString(err));
+		      alGetString(err));
 	}
 }