[PATCH] btfrs: initialize return of btrfs_extent_same

[trix]

From: Tom Rix <t...@redhat.com>

clang static analysis flags a garbage return

fs/btrfs/reflink.c:611:2: warning: Undefined or garbage value returned to 
caller [core.uninitialized.UndefReturn]
        return ret;
        ^~~~~~~~~~
ret will not be set when olen is 0
When olen is 0, this function does no work.

So initialize ret to 0

Signed-off-by: Tom Rix <t...@redhat.com>
---
 fs/btrfs/reflink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/reflink.c b/fs/btrfs/reflink.c
index 040009d1cc31..200a80fcbecb 100644
--- a/fs/btrfs/reflink.c
+++ b/fs/btrfs/reflink.c
@@ -572,7 +572,7 @@ static int btrfs_extent_same_range(struct inode *src, u64 
loff, u64 len,
 static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
                             struct inode *dst, u64 dst_loff)
 {
-       int ret;
+       int ret = 0;
        u64 i, tail_len, chunk_count;
        struct btrfs_root *root_dst = BTRFS_I(dst)->root;
 
-- 
2.18.1