Fix mutualy exclusive options parsing.

openup

@@ -215,15 +215,17 @@ done
 
 check_openupd
 
-if [ -z "${checkmode}" ]; then
+if [ -n "${nosig}" -o -n "${dryrun}" -a -n "${dryrun}" ]; then
+	usage
+fi
+
+if [ "${checkmode}" ]; then
+	check_vuxml
+
+else
 	if [ -z "${nosig}" ]; then get_cert; fi
 	update_binpatches
 	update_pkg
-else
-	if [ "${nosig}" -o "${dryrun}" ]; then
-		usage
-	fi
-	check_vuxml
 fi
 
 rm -f ${_TMPDIR}/.openup-*