Pass NULL as empty argument

src/daemons/rhsmcertd.c

@@ -449,7 +449,7 @@ static gboolean
 initial_cert_check (gpointer data)
 {
     struct CertCheckData *cert_data = data;
-    cert_check (data);
+    cert_check (NULL);
     // Add the timeout to begin waiting on interval but offset by the initial
     // delay.
     g_timeout_add (cert_data->interval_seconds * 1000,