vfio/pci: Clear MSI-X IRQ index always

Cédric Le Goaterrequested to merge
clegoate/qemu-kvm-centos:RHEL-21293 into c9s

JIRA: https://issues.redhat.com/browse/RHEL-21293

Signed-off-by: Cédric Le Goater clg@redhat.com

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