kdc: fix dh->q allocation check in get_dh_param()

Thanks to Doug Nazar <nazard@nazar.ca> for spotting this!

BUG: https://bugzilla.samba.org/show_bug.cgi?id=12986

Signed-off-by: Stefan Metzmacher <metze@samba.org>

kdc/pkinit.c

@@ -353,7 +353,7 @@ get_dh_param(krb5_context context,
 
     if (dhparam.q) {
 	dh->q = integer_to_BN(context, "DH p-1 factor", dhparam.q);
-	if (dh->g == NULL)
+	if (dh->q == NULL)
 	    goto out;
     }