vfio/fsl-mc: Remove unused variable 'hwirq'

Commit 7447d911 ("vfio/fsl-mc: Block calling interrupt handler without trigger")
left this variable unused, so remove it.

Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20240730141133.525771-1-yuehaibing@huawei.com


Signed-off-by: Alex Williamson <alex.williamson@redhat.com>