btrfs: extent_io: Move the BUG_ON() in flush_write_bio() one level up
We have a BUG_ON() in flush_write_bio() to handle the return value of submit_one_bio(). Move the BUG_ON() one level up to all its callers. This patch will introduce temporary variable, @flush_ret to keep code change minimal in this patch. That variable will be cleaned up when enhancing the error handling later. Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de> 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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