fix a bug where getting OS Mixer volume may fail, and we were closing

the fd, but didn't mark anything indicated the fd was close, so chaos
ensued.  Here, we just remove the close() statement and assume it was
just a fluke!!

git-svn-id: https://svn.musicpd.org/mpd/trunk@125 09075e82-0dd4-0310-85a5-a0d7c8717e4f

src/volume.c

@@ -118,7 +118,6 @@ int getOssVolumeLevel() {
 	int left, right, level;
 
 	if(ioctl(volume_ossFd,MIXER_READ(volume_ossControl),&level) < 0) {
-		while(close(volume_ossFd)<0 && errno==EINTR);
 		ERROR("unable to read volume\n");
 		return -1;
 	}