qemu: capabilities: fix machine name/canonical swappage

Things are supposed to look like:

<machine canonical='pc-0.12'>pc</machine>

But are currently swapped. This can cause many VMs to revert to having
machine type='pc' which will affect save/restore across qemu upgrades.

src/qemu/qemu_capabilities.c

@@ -2046,20 +2046,15 @@ qemuCapsProbeQMPMachineTypes(qemuCapsPtr caps,
 
     for (i = 0 ; i < nmachines ; i++) {
         if (machines[i]->alias) {
-            if (!(caps->machineAliases[i] = strdup(machines[i]->name))) {
-                virReportOOMError();
-                goto cleanup;
-            }
-            if (!(caps->machineTypes[i] = strdup(machines[i]->alias))) {
-                virReportOOMError();
-                goto cleanup;
-            }
-        } else {
-            if (!(caps->machineTypes[i] = strdup(machines[i]->name))) {
+            if (!(caps->machineAliases[i] = strdup(machines[i]->alias))) {
                 virReportOOMError();
                 goto cleanup;
             }
         }
+        if (!(caps->machineTypes[i] = strdup(machines[i]->name))) {
+            virReportOOMError();
+            goto cleanup;
+        }
         if (machines[i]->isDefault)
             defIdx = i;
     }