[PATCH] btrfs: fix memdup.cocci warnings

[Julia Lawall]

From: kernel test robot <lkp@xxxxxxxxx>

fs/btrfs/send.c:3854:8-15: WARNING opportunity for kmemdup

 Use kmemdup rather than duplicating its implementation

Generated by: scripts/coccinelle/api/memdup.cocci

Fixes: 28314eb24e6c ("btrfs: send, recompute reference path after orphanization of a directory")
Signed-off-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: Julia Lawall <julia.lawall@xxxxxxxx>
---

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/fdmanana/linux.git misc-next
head:   28314eb24e6cb8124d1e5da2ef2ccb90ec44cc06
commit: 28314eb24e6cb8124d1e5da2ef2ccb90ec44cc06 [2/2] btrfs: send, recompute reference path after orphanization of a directory
:::::: branch date: 17 hours ago
:::::: commit date: 17 hours ago


 send.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -3851,10 +3851,9 @@ static int refresh_ref_path(struct send_
 	char *name;
 	int ret;

-	name = kmalloc(ref->name_len, GFP_KERNEL);
+	name = kmemdup(ref->name, ref->name_len, GFP_KERNEL);
 	if (!name)
 		return -ENOMEM;
-	memcpy(name, ref->name, ref->name_len);

 	fs_path_reset(ref->full_path);
 	ret = get_cur_path(sctx, ref->dir, ref->dir_gen, ref->full_path);