BUG_ON() Conversion in ipc/msg.c

this changes if() BUG(); constructs to BUG_ON() which is
cleaner, contains unlikely() and can better optimized away.
Signed-off-by: NEric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: NAdrian Bunk <bunk@stusta.de>

ipc/msg.c

@@ -220,8 +220,7 @@ asmlinkage long sys_msgget (key_t key, int msgflg)
 		ret = -EEXIST;
 	} else {
 		msq = msg_lock(id);
-		if(msq==NULL)
-			BUG();
+		BUG_ON(msq==NULL);
 		if (ipcperms(&msq->q_perm, msgflg))
 			ret = -EACCES;
 		else {