qemu: Fix cgroup handling when setting VCPU BW

Commit 632f78ca introduced a regression which causes schedinfo being
unable to set some parameters.  When migrating to priv->cgroup there
was missing variable left out and due to passed NULL to underlying
function, the setting failed.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=963592

src/qemu/qemu_driver.c

@@ -8009,7 +8009,6 @@ qemuDomainSetSchedulerParametersFlags(virDomainPtr dom,
 {
     virQEMUDriverPtr driver = dom->conn->privateData;
     int i;
-    virCgroupPtr group = NULL;
     virDomainObjPtr vm = NULL;
     virDomainDefPtr vmdef = NULL;
     unsigned long long value_ul;
@@ -8087,7 +8086,7 @@ qemuDomainSetSchedulerParametersFlags(virDomainPtr dom,
                               QEMU_SCHED_MIN_PERIOD, QEMU_SCHED_MAX_PERIOD);
 
             if (flags & VIR_DOMAIN_AFFECT_LIVE && value_ul) {
-                if ((rc = qemuSetVcpusBWLive(vm, group, value_ul, 0)))
+                if ((rc = qemuSetVcpusBWLive(vm, priv->cgroup, value_ul, 0)))
                     goto cleanup;
 
                 vm->def->cputune.period = value_ul;
@@ -8101,7 +8100,7 @@ qemuDomainSetSchedulerParametersFlags(virDomainPtr dom,
                               QEMU_SCHED_MIN_QUOTA, QEMU_SCHED_MAX_QUOTA);
 
             if (flags & VIR_DOMAIN_AFFECT_LIVE && value_l) {
-                if ((rc = qemuSetVcpusBWLive(vm, group, 0, value_l)))
+                if ((rc = qemuSetVcpusBWLive(vm, priv->cgroup, 0, value_l)))
                     goto cleanup;
 
                 vm->def->cputune.quota = value_l;
@@ -8115,7 +8114,8 @@ qemuDomainSetSchedulerParametersFlags(virDomainPtr dom,
                               QEMU_SCHED_MIN_PERIOD, QEMU_SCHED_MAX_PERIOD);
 
             if (flags & VIR_DOMAIN_AFFECT_LIVE && value_ul) {
-                if ((rc = qemuSetEmulatorBandwidthLive(vm, group, value_ul, 0)))
+                if ((rc = qemuSetEmulatorBandwidthLive(vm, priv->cgroup,
+                                                       value_ul, 0)))
                     goto cleanup;
 
                 vm->def->cputune.emulator_period = value_ul;
@@ -8129,7 +8129,8 @@ qemuDomainSetSchedulerParametersFlags(virDomainPtr dom,
                               QEMU_SCHED_MIN_QUOTA, QEMU_SCHED_MAX_QUOTA);
 
             if (flags & VIR_DOMAIN_AFFECT_LIVE && value_l) {
-                if ((rc = qemuSetEmulatorBandwidthLive(vm, group, 0, value_l)))
+                if ((rc = qemuSetEmulatorBandwidthLive(vm, priv->cgroup,
+                                                       0, value_l)))
                     goto cleanup;
 
                 vm->def->cputune.emulator_quota = value_l;