[PATCH] dm: Fix error cleanup in dm_create_persistent()

dm-exception-store.c: Fix error cleanup in dm_create_persistent().
This was originally found by chrisw during code review.

From: Dave Olien <dmo@osdl.org>
Signed-off-by: Kevin Corry <kevcorry@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/md/dm-exception-store.c

@@ -569,8 +569,8 @@ int dm_create_persistent(struct exception_store *store, uint32_t chunk_size)
       bad:
 	dm_io_put(sectors_to_pages(chunk_size));
 	if (ps) {
-		if (ps->callbacks)
-			vfree(ps->callbacks);
+		if (ps->area)
+			free_area(ps);
 
 		kfree(ps);
 	}