[PATCH] btrfs: scrub: fix a compilation warning

[Lu Yao]

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

Signed-off-by: Lu Yao <yaolu@xxxxxxxxxx>
---
gcc version: (Debian 10.2.1-6) 10.2.1 20210110
---
 fs/btrfs/scrub.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 4b22cfe9a98c..afd6932f5e89 100644
--- 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);
-- 
2.25.1