btrfs: scrub: initialize ret in scrub_simple_mirror() to fix compilation warning

The following error message is displayed:
  ../fs/btrfs/scrub.c:2152:9: error: ‘ret’ may be used uninitialized
  in this function [-Werror=maybe-uninitialized]"

Compiler version: gcc version: (Debian 10.2.1-6) 10.2.1 20210110

Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: Lu Yao <yaolu@kylinos.cn>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 4b22cfe..afd6932 100644 (file)
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -2100,7 +2100,7 @@ static int scrub_simple_mirror(struct scrub_ctx *sctx,
        struct btrfs_fs_info *fs_info = sctx->fs_info;
        const u64 logical_end = logical_start + logical_length;
        u64 cur_logical = logical_start;
-       int ret;
+       int ret = 0;
 
        /* The range must be inside the bg */
        ASSERT(logical_start >= bg->start && logical_end <= bg->start + bg->length);