irq already contains the interrupt number for the port, don't add the
port index to it.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NTejun Heo <tj@kernel.org>
Fixes: d684a90d ("ahci: per-port msix support")
Cc: stable@vger.kernel.org v4.5+