Fix res_musiconhold lock

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6831 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_musiconhold.c

@@ -1066,7 +1066,7 @@ static void ast_moh_destroy(void)
 			pid = moh->pid;
 			moh->pid = 0;
 			kill(pid, SIGKILL);
-			while ((ast_wait_for_input(moh->srcfd, 100) > -1) && (bytes = read(moh->srcfd, buff, 8192)) && time(NULL) < stime) {
+			while ((ast_wait_for_input(moh->srcfd, 100) > 0) && (bytes = read(moh->srcfd, buff, 8192)) && time(NULL) < stime) {
 				tbytes = tbytes + bytes;
 			}
 			ast_log(LOG_DEBUG, "mpg123 pid %d and child died after %d bytes read\n", pid, tbytes);