qemu: Only check for NUMA availability if required

We only care about NUMA availability if NUMA configuration is requested
in domain XML.

src/qemu/qemu_process.c

@@ -1197,6 +1197,9 @@ qemuProcessInitNumaMemoryPolicy(virDomainObjPtr vm)
     int i = 0;
     int maxnode = 0;
 
+    if (!vm->def->numatune.memory.nodemask)
+        return 0;
+
     VIR_DEBUG("Setting NUMA memory policy");
 
     if (numa_available() < 0) {
@@ -1205,9 +1208,6 @@ qemuProcessInitNumaMemoryPolicy(virDomainObjPtr vm)
         return -1;
     }
 
-    if (!vm->def->numatune.memory.nodemask)
-        return 0;
-
     if (VIR_ALLOC(mask) < 0) {
         virReportOOMError();
         return -1;