qemuDomainSetNumaParamsLive: Check for NUMA mode more wisely

https://bugzilla.redhat.com/show_bug.cgi?id=1232663

In one of my previous ptaches (bcd9a564) I've tried to fix the problem
that we blindly assumed strict NUMA mode for guests. This led to
several problems like us pinning a domain onto a nodeset via libnuma
among with CGroups. Once the nodeset was changed by user, well, it did
not result in desired effect. See the original commit for more info.
But, the commit I wrote had a bug: when NUMA parameters are changed on
a running domain we require domain to be strictly pinned onto a
nodeset. Due to a typo a condition was mis-evaluated.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

src/qemu/qemu_driver.c

@@ -9954,7 +9954,7 @@ qemuDomainSetNumaParamsLive(virDomainObjPtr vm,
     size_t i = 0;
     int ret = -1;
 
-    if (virDomainNumatuneGetMode(vm->def->numa, -1, &mode) < 0 ||
+    if (virDomainNumatuneGetMode(vm->def->numa, -1, &mode) == 0 &&
         mode != VIR_DOMAIN_NUMATUNE_MEM_STRICT) {
         virReportError(VIR_ERR_OPERATION_INVALID, "%s",
                        _("change of nodeset for running domain "