save domain status after modifing vcpupin

We should save domain status after modifing vcpupin. If not,
we will get wrong vcpupin information after rebooting libvirtd.

src/qemu/qemu_driver.c

@@ -3126,6 +3126,8 @@ qemudDomainPinVcpuFlags(virDomainPtr dom,
             }
         }
 
+        if (virDomainSaveStatus(driver->caps, driver->stateDir, vm) < 0)
+            goto cleanup;
     }
 
     if (flags & VIR_DOMAIN_AFFECT_CONFIG) {