dm io: fix duplicate bio completion due to missing ref count
If only a subset of the devices associated with multiple regions support a given special operation (eg. DISCARD) then the dec_count() that is used to set error for the region must increment the io->count. Otherwise, when the dec_count() is called it can cause the dm-io caller's bio to be completed multiple times. As was reported against the dm-mirror target that had mirror legs with a mix of discard capabilities. Bug: https://bugzilla.kernel.org/show_bug.cgi?id=196077Reported-by: NZhang Yi <yizhan@redhat.com> Signed-off-by: NMike Snitzer <snitzer@redhat.com>
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