qemuDomainAttachNetDevice: use only one virErrorPtr variable

Commit f7b55665 added 'save_error' even though the function
already has 'originalError' used in the 'try_remove' section.
Signed-off-by: NJán Tomko <jtomko@redhat.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

src/qemu/qemu_hotplug.c

@@ -1205,7 +1205,6 @@ qemuDomainAttachNetDevice(virQEMUDriverPtr driver,
     bool charDevPlugged = false;
     bool netdevPlugged = false;
     char *netdev_name;
-    virErrorPtr save_error = NULL;
 
     /* preallocate new slot for device */
     if (VIR_REALLOC_N(vm->def->nets, vm->def->nnets + 1) < 0)
@@ -1487,9 +1486,9 @@ qemuDomainAttachNetDevice(virQEMUDriverPtr driver,
             qemuDomainReleaseDeviceAddress(vm, &net->info, NULL);
 
         if (iface_connected) {
-            virErrorPreserveLast(&save_error);
+            virErrorPreserveLast(&originalError);
             virDomainConfNWFilterTeardown(net);
-            virErrorRestore(&save_error);
+            virErrorRestore(&originalError);
 
             if (virDomainNetGetActualType(net) == VIR_DOMAIN_NET_TYPE_DIRECT) {
                 ignore_value(virNetDevMacVLanDeleteWithVPortProfile(