qemu/virtio-pci: remove unnecessary check

it's safe to call msix_write_config if msix
is disabled, so call it unconditionally on
pci config write.
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

hw/virtio-pci.c

@@ -373,7 +373,6 @@ static void virtio_write_config(PCIDevice *pci_dev, uint32_t address,
     }
 
     pci_default_write_config(pci_dev, address, val, len);
-    if(proxy->vdev->nvectors)
     msix_write_config(pci_dev, address, val, len);
 }