mm/frontswap: cleanup doc and comment error

Signed-off-by: Wanpeng Li <liwp.linux@gmail.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
diff --git a/mm/frontswap.c b/mm/frontswap.c
index 5318b3a..6b3e71a 100644
--- a/mm/frontswap.c
+++ b/mm/frontswap.c
@@ -120,7 +120,7 @@
  * "Store" data from a page to frontswap and associate it with the page's
  * swaptype and offset.  Page must be locked and in the swap cache.
  * If frontswap already contains a page with matching swaptype and
- * offset, the frontswap implmentation may either overwrite the data and
+ * offset, the frontswap implementation may either overwrite the data and
  * return success or invalidate the page from frontswap and return failure.
  */
 int __frontswap_store(struct page *page)