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We take two stripe numbers if vertical errors are found.  In case it is
just a pstripe it does not matter but in case of raid 6 it matters as
both stripes need to be fixed.

Fixes: 7a315072

 ("btrfs: raid56: do data csum verification during RMW cycle")
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Tanmay Bhushan <007047221b@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>