Btrfs: fix NULL pointer dereference in log_dir_items
0, 1 and <0 can be returned by btrfs_next_leaf(), and when <0 is returned, path->nodes[0] could be NULL, log_dir_items lacks such a check for <0 and we may run into a null pointer dereference panic. Fixes: e02119d5 ("Btrfs: Add a write ahead tree log to optimize synchronous operations") Reviewed-by: NNikolay Borisov <nborisov@suse.com> Signed-off-by: NLiu Bo <bo.liu@linux.alibaba.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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