IPC/semaphores: remove one unused parameter from semctl_down()

semctl_down() takes one unused parameter: semnum.  This patch proposes to get
rid of it.
Signed-off-by: NPierre Peiffer <pierre.peiffer@bull.net>
Acked-by: NSerge Hallyn <serue@us.ibm.com>
Cc: Nadia Derbey <Nadia.Derbey@bull.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

ipc/sem.c

@@ -880,7 +880,7 @@ static inline unsigned long copy_semid_from_user(struct sem_setbuf *out, void __
  * to be held in write mode.
  * NOTE: no locks must be held, the rw_mutex is taken inside this function.
  */
-static int semctl_down(struct ipc_namespace *ns, int semid, int semnum,
+static int semctl_down(struct ipc_namespace *ns, int semid,
 		       int cmd, int version, union semun arg)
 {
 	struct sem_array *sma;
@@ -972,7 +972,7 @@ asmlinkage long sys_semctl (int semid, int semnum, int cmd, union semun arg)
 		return err;
 	case IPC_RMID:
 	case IPC_SET:
-		err = semctl_down(ns,semid,semnum,cmd,version,arg);
+		err = semctl_down(ns, semid, cmd, version, arg);
 		return err;
 	default:
 		return -EINVAL;