fix -loop problem

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@9590 b3059339-0415-0410-9bf9-f77b7e298cf2

libao2/ao_win32.c

@@ -152,6 +152,7 @@ static int init(int rate,int channels,int format,int flags)
 	waveOutGetVolume(hWaveOut,&restoredvolume); 
 	//allocate buffer memory as one big block
 	buffer = malloc(totalBufferSize);
+	memset(buffer,0x0,totalBufferSize);
     //and setup pointers to each buffer 
     waveBlocks = (WAVEHDR*)buffer;
     buffer += sizeof(WAVEHDR) * BUFFER_COUNT;