mm/vmscan.c: fix typo

Change "optizimation" to "optimization".

Signed-off-by: dylan-meiners <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Reviewed-by: David Hildenbrand <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Linus Torvalds <[email protected]>

Author: dylan-meiners

mm/vmscan.c

@@ -910,7 +910,7 @@ static int __remove_mapping(struct address_space *mapping, struct page *page,
 		 * order to detect refaults, thus thrashing, later on.
 		 *
 		 * But don't store shadows in an address space that is
-		 * already exiting.  This is not just an optizimation,
+		 * already exiting.  This is not just an optimization,
 		 * inode reclaim needs to empty out the radix tree or
 		 * the nodes are lost.  Don't plant shadows behind its
 		 * back.