btrfs: handle btrfs_cow_block errors in replace_path
If we error out COWing the root node when doing a replace_path then we simply unlock and free the buffer and return the error. Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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