tests: qemublocktest: fix memory leak

Set enccount to 1, so the cleanup function knows
there is something to be cleaned up.

Fixes: 1992ae40fac90c315d0d8d1a9c6f880bd0a39b57

Signed-off-by: Ján Tomko <jtomko@redhat.com>

tests/qemublocktest.c

@@ -242,6 +242,7 @@ testQemuDiskXMLToJSONFakeSecrets(virStorageSource *src)
 
         srcpriv->encinfo[0]->alias = g_strdup_printf("%s-encalias",
                                                      NULLSTR(src->nodeformat));
+        srcpriv->enccount = 1;
     }
 
     return 0;