[PATCH] ext4: use swap macro in mext_page_double_lock

[Gustavo A. R. Silva]

Make use of the swap macro and remove unnecessary variable *tmp*.
This makes the code easier to read and maintain. Also, reduces the
stack usage.

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gust...@embeddedor.com>
---
 fs/ext4/move_extent.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index 8e17efd..a409ff7 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -134,9 +134,7 @@ mext_page_double_lock(struct inode *inode1, struct inode 
*inode2,
                mapping[0] = inode1->i_mapping;
                mapping[1] = inode2->i_mapping;
        } else {
-               pgoff_t tmp = index1;
-               index1 = index2;
-               index2 = tmp;
+               swap(index1, index2);
                mapping[0] = inode2->i_mapping;
                mapping[1] = inode1->i_mapping;
        }
-- 
2.7.4