conf: Assign explicit value to VIR_DOMAIN_CONTROLLER_PCI_MODEL_NAME_NONE

Pretty much any reasonable compiler would do this automatically,
but there's no harm in being explicit about it.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NLaine Stump <laine@laine.org>

src/conf/domain_conf.h

@@ -700,7 +700,7 @@ typedef enum {
 } virDomainControllerModelPCI;
 
 typedef enum {
-    VIR_DOMAIN_CONTROLLER_PCI_MODEL_NAME_NONE,
+    VIR_DOMAIN_CONTROLLER_PCI_MODEL_NAME_NONE = 0,
     VIR_DOMAIN_CONTROLLER_PCI_MODEL_NAME_PCI_BRIDGE,
     VIR_DOMAIN_CONTROLLER_PCI_MODEL_NAME_I82801B11_BRIDGE,
     VIR_DOMAIN_CONTROLLER_PCI_MODEL_NAME_IOH3420,