rmap: move label `out' to a better place

When the code jumps to the `out', `referenced' is still zero.  So there is
no need to check it.

Signed-off-by: Huang Shijie <shijie8@gmail.com>
Acked-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/rmap.c

@@ -388,9 +388,10 @@ static int page_referenced_one(struct page *page,
 out_unmap:
 	(*mapcount)--;
 	pte_unmap_unlock(pte, ptl);
-out:
+
 	if (referenced)
 		*vm_flags |= vma->vm_flags;
+out:
 	return referenced;
 }