conf: hostdev: Introduce virDomainHostdevSubsysSCSIClear

Just a tiny wrapper over the SCSI def clearing logic to drop some
if-else branches from a switch, mainly because extending the switch in
the future would render the current code with branching less readable.
Signed-off-by: NErik Skultety <eskultet@redhat.com>

src/conf/domain_conf.c

@@ -2303,6 +2303,17 @@ virDomainHostdevSubsysSCSIiSCSIClear(virDomainHostdevSubsysSCSIiSCSIPtr iscsisrc
     iscsisrc->auth = NULL;
 }
 
+
+static void
+virDomainHostdevSubsysSCSIClear(virDomainHostdevSubsysSCSIPtr scsisrc)
+{
+    if (scsisrc->protocol == VIR_DOMAIN_HOSTDEV_SCSI_PROTOCOL_TYPE_ISCSI)
+        virDomainHostdevSubsysSCSIiSCSIClear(&scsisrc->u.iscsi);
+    else
+        VIR_FREE(scsisrc->u.host.adapter);
+}
+
+
 void virDomainHostdevDefClear(virDomainHostdevDefPtr def)
 {
     if (!def)
@@ -2336,17 +2347,17 @@ void virDomainHostdevDefClear(virDomainHostdevDefPtr def)
         }
         break;
     case VIR_DOMAIN_HOSTDEV_MODE_SUBSYS:
-        if (def->source.subsys.type == VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_SCSI) {
-            virDomainHostdevSubsysSCSIPtr scsisrc = &def->source.subsys.u.scsi;
-            if (scsisrc->protocol ==
-                VIR_DOMAIN_HOSTDEV_SCSI_PROTOCOL_TYPE_ISCSI) {
-                virDomainHostdevSubsysSCSIiSCSIClear(&scsisrc->u.iscsi);
-            } else {
-                VIR_FREE(scsisrc->u.host.adapter);
-            }
-        } else if (def->source.subsys.type == VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_SCSI_HOST) {
-            virDomainHostdevSubsysSCSIVHostPtr hostsrc = &def->source.subsys.u.scsi_host;
-            VIR_FREE(hostsrc->wwpn);
+        switch ((virDomainHostdevSubsysType) def->source.subsys.type) {
+        case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_SCSI:
+            virDomainHostdevSubsysSCSIClear(&def->source.subsys.u.scsi);
+            break;
+        case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_SCSI_HOST:
+            VIR_FREE(def->source.subsys.u.scsi_host.wwpn);
+            break;
+        case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB:
+        case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI:
+        case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_LAST:
+            break;
         }
         break;
     }