mm: correct a couple of page migration comments

It's migrate.c not migration,c, and nowadays putback_movable_pages() not
putback_lru_pages().
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Rafael Aquini <aquini@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/migrate.c

 /*
- * Memory Migration functionality - linux/mm/migration.c
+ * Memory Migration functionality - linux/mm/migrate.c
  *
  * Copyright (C) 2006 Silicon Graphics, Inc., Christoph Lameter
  *
@@ -1113,7 +1113,7 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
  *
  * The function returns after 10 attempts or if no pages are movable any more
  * because the list has become empty or no retryable pages exist any more.
- * The caller should call putback_lru_pages() to return pages to the LRU
+ * The caller should call putback_movable_pages() to return pages to the LRU
  * or free list only if ret != 0.
  *
  * Returns the number of pages that were not migrated, or an error code.