btrfs: sink write_flags to __extent_writepage_io
__extent_writepage reads write flags from wbc and passes both to __extent_writepage_io. This makes write_flags redundant and we can remove it. Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de> Reviewed-by: NNikolay Borisov <nborisov@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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