btrfs: Make btrfs_(set|clear)_header_flag return void
From the introduction of btrfs_(set|clear)_header_flag, there is no usage of its return value. So just make it return void. Reviewed-by: NNikolay Borisov <nborisov@suse.com> Signed-off-by: NQu Wenruo <wqu@suse.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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