xenapi: remove unused variable

  CC     libvirt_driver_xenapi_la-xenapi_driver.lo
xenapi/xenapi_driver.c: In function 'xenapiDomainGetVcpus':
xenapi/xenapi_driver.c:1209:21: error: variable 'cpus' set but not used [-Werror=unused-but-set-variable]

* src/xenapi/xenapi_driver.c (xenapiDomainGetVcpus): Silence
compiler warning.

src/xenapi/xenapi_driver.c

@@ -1206,7 +1206,7 @@ xenapiDomainGetVcpus (virDomainPtr dom,
     xen_vm_set *vms = NULL;
     xen_vm vm = NULL;
     xen_string_string_map *vcpu_params = NULL;
-    int nvcpus = 0, cpus = 0, i;
+    int nvcpus = 0, i;
     virDomainInfo domInfo;
     virNodeInfo nodeInfo;
     virVcpuInfoPtr ifptr;
@@ -1221,9 +1221,7 @@ xenapiDomainGetVcpus (virDomainPtr dom,
                                   _("Couldn't fetch Domain Information"));
         return -1;
     }
-    if (xenapiNodeGetInfo(dom->conn, &nodeInfo) == 0)
-        cpus = nodeInfo.cpus;
-    else {
+    if (xenapiNodeGetInfo(dom->conn, &nodeInfo) != 0) {
         xenapiSessionErrorHandler(dom->conn, VIR_ERR_INTERNAL_ERROR,
                                   _("Couldn't fetch Node Information"));
         return -1;