two ahci fixes from code inspection

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Hi Tejun,

below are two things in ahci I found while converting the driver
to the new MSI / MSI-X vector allocator.

The first one looks like an obvious bug to me if we every have
these stray ports in a per-port IRQ vector setup.

The others one is more elaborate, but I think the per-port locking
is something we should do for the per-port MSI-X case just like for
the per-port MSI case.

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