igb: don't allow SR-IOV without MSI-X
MSI-X interrupts are required for SR-IOV operation. Check to make sure they're enabled before allowing the user to turn on VFs. Signed-off-by: NMitch Williams <mitch.a.williams@intel.com> Tested-by: NAaron Brown <aaron.f.brown@intel.com> Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
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