btrfs: remove open-coded swap() in backref.c:__merge_refs

The kernel provides a swap() that does the same thing as this code.

Signed-off-by: Dave Jones <dsj@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 3 insertions, 6 deletions

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index b90cd3776f8e..dc6e9a32d019 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -566,17 +566,14 @@ static void __merge_refs(struct list_head *head, int mode)
                 struct __prelim_ref *pos2 = pos1, *tmp;
 
                 list_for_each_entry_safe_continue(pos2, tmp, head, list) {
-                        struct __prelim_ref *xchg, *ref1 = pos1, *ref2 = pos2;
+                        struct __prelim_ref *ref1 = pos1, *ref2 = pos2;
                         struct extent_inode_elem *eie;
 
                         if (!ref_for_same_block(ref1, ref2))
                                 continue;
                         if (mode == 1) {
-                                if (!ref1->parent && ref2->parent) {
-                                        xchg = ref1;
-                                        ref1 = ref2;
-                                        ref2 = xchg;
-                                }
+                                if (!ref1->parent && ref2->parent)
+                                        swap(ref1, ref2);
                         } else {
                                 if (ref1->parent != ref2->parent)
                                         continue;