networkxml2xmltest: Complete renaming of @actual

In 97a0aa24 the @actual variable was renamed to @confactual.
However, the commit missed non-Linux case resulting in a broken
build.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

tests/networkxml2conftest.c

@@ -58,7 +58,7 @@ testCompareXMLToConfFiles(const char *inxml, const char *outconf,
                                  "except-interface=lo\n")))
         goto fail;
     VIR_FREE(confactual);
-    actual = g_steal_pointer(&tmp);
+    confactual = g_steal_pointer(&tmp);
 #endif
 
     if (virTestCompareToFile(confactual, outconf) < 0)