btrfs: subpage: make end_compressed_bio_writeback() compatible
In end_compressed_writeback() we just clear the full page writeback. For subpage case, if there are two delalloc ranges in the same page, the 2nd range will trigger a BUG_ON() as the page writeback is already cleared by previous range. Fix it by using btrfs_page_clamp_clear_writeback() helper. Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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