ipc/mqueue: simplify reading msgqueue limit

Because the current task is being used to get the limit, we can simply
use rlimit() instead of task_rlimit().

Signed-off-by: Davidlohr Bueso <dave@gnu.org>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

ipc/mqueue.c

@@ -128,7 +128,6 @@ static struct inode *mqueue_get_inode(struct super_block *sb,
 
 	if (S_ISREG(mode)) {
 		struct mqueue_inode_info *info;
-		struct task_struct *p = current;
 		unsigned long mq_bytes, mq_msg_tblsz;
 
 		inode->i_fop = &mqueue_file_operations;
@@ -159,7 +158,7 @@ static struct inode *mqueue_get_inode(struct super_block *sb,
 
 		spin_lock(&mq_lock);
 		if (u->mq_bytes + mq_bytes < u->mq_bytes ||
-		    u->mq_bytes + mq_bytes > task_rlimit(p, RLIMIT_MSGQUEUE)) {
+		    u->mq_bytes + mq_bytes > rlimit(RLIMIT_MSGQUEUE)) {
 			spin_unlock(&mq_lock);
 			/* mqueue_evict_inode() releases info->messages */
 			ret = -EMFILE;