[patch] btrfs: scrub: silence an uninitialized variable warning

[Dan Carpenter]

It's basically harmless if "ref_level" isn't initialized since it's only
used for an error message, but it causes a static checker warning.

Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index e42aa27..39dbdcb 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -611,7 +611,7 @@ static void scrub_print_warning(const char *errstr, struct 
scrub_block *sblock)
        u64 flags = 0;
        u64 ref_root;
        u32 item_size;
-       u8 ref_level;
+       u8 ref_level = 0;
        int ret;
 
        WARN_ON(sblock->page_count < 1);