ipc/shm.c: remove the superfluous break

Remove the superfuous break, as there is a 'return' before it.
Signed-off-by: Liao Pingfang <liao.pingfang@zte.com.cn>
Signed-off-by: Yi Wang <wang.yi59@zte.com.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/1594724361-11525-1-git-send-email-wang.yi59@zte.com.cnSigned-off-by: Linus Torvalds <torvalds@linux-foundation.org>

ipc/shm.c

@@ -1380,7 +1380,6 @@ static long compat_ksys_shmctl(int shmid, int cmd, void __user *uptr, int versio
 	case SHM_LOCK:
 	case SHM_UNLOCK:
 		return shmctl_do_lock(ns, shmid, cmd);
-		break;
 	default:
 		return -EINVAL;
 	}