[PATCH] btrfs: fix uninitialized variable warnings

[pengfuyuan]

There are some warnings on older compilers (gcc 10, 7) or non-x86_64
architectures (mips64).  As btrfs wants to enable -Wmaybe-uninitialized
by default, fix the warnings even though it's not necessary on recent
compilers (gcc 12+).

    fs/btrfs/tree-log.c: In function â??btrfs_log_inodeâ??:
    fs/btrfs/tree-log.c:6211:9: error: â??last_range_startâ?? may be used uninitialized in this function [-Werror=maybe-uninitialized]
     6211 |   ret = insert_dir_log_key(trans, log, path, key.objectid,
          |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     6212 |       first_dir_index, last_dir_index);
          |       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    fs/btrfs/tree-log.c:6161:6: note: â??last_range_startâ?? was declared here
     6161 |  u64 last_range_start;
          |      ^~~~~~~~~~~~~~~~
    cc1: all warnings being treated as errors

Reported-by: k2ci <kernel-bot@xxxxxxxxxx>
Signed-off-by: pengfuyuan <pengfuyuan@xxxxxxxxxx>
---
 fs/btrfs/tree-log.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 9b212e8c70cc..d2755d5e338b 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -6158,7 +6158,7 @@ static int log_delayed_deletions_incremental(struct btrfs_trans_handle *trans,
 {
 	struct btrfs_root *log = inode->root->log_root;
 	const struct btrfs_delayed_item *curr;
-	u64 last_range_start;
+	u64 last_range_start = 0;
 	u64 last_range_end = 0;
 	struct btrfs_key key;
 
-- 
2.25.1

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