Typo fixes retrun -> return

Typo fixes retrun -> return

Signed-off-by: Gabriel Craciunescu <nix.or.die@googlemail.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
diff --git a/mm/migrate.c b/mm/migrate.c
index 4d6ee03..6a207e8 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -706,7 +706,7 @@
  * The function returns after 10 attempts or if no pages
  * are movable anymore because to has become empty
  * or no retryable pages exist anymore. All pages will be
- * retruned to the LRU or freed.
+ * returned to the LRU or freed.
  *
  * Return: Number of pages not migrated or error code.
  */