Bugfix #9 : mplayer false failure

The du command was sending KB instead of bytes when file was "big"
leading to a false failure.

check.sh

@@ -340,7 +340,7 @@ check_audiostream_mplayer() {
 
 	$MPLAYER -endpos $sz_kb -ao pcm:file=$tmpfile "$1" 1>/dev/null 2>/dev/null
 	res=$?
-	bytes=$(du $tmpfile | cut -f1)
+	bytes=$(du -b $tmpfile | cut -f1)
 	rm $tmpfile 2>/dev/null
 
 	if [ "$bytes" -lt $expt_sz ]