libqos/ahci: allow nondata commands for ahci_io variants
These variants try to set a data offset, even if you don't specify one.
In the cases where the offset is zero and it's a nondata command, just
ignore the instruction.
Signed-off-by: NJohn Snow <jsnow@redhat.com>
Message-id: 1452282920-21550-7-git-send-email-jsnow@redhat.com
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