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: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

hw/virtio-pci.c

diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
index 0b1cea9..5c97629 100644
--- a/hw/virtio-pci.c
+++ b/hw/virtio-pci.c
@@ -373,8 +373,7 @@
     }
 
     pci_default_write_config(pci_dev, address, val, len);
-    if(proxy->vdev->nvectors)
-        msix_write_config(pci_dev, address, val, len);
+    msix_write_config(pci_dev, address, val, len);
 }
 
 static const VirtIOBindings virtio_pci_bindings = {