Add missing docblock for xmldb_local_travis_upgrade.

Author: kabalin

tests/Fixture/broken-upgrade.php

@@ -22,8 +22,15 @@
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+/**
+ * Execute local_travis upgrade from the given old version.
+ *
+ * @param int $oldversion
+ * @return bool
+ */
 function xmldb_local_travis_upgrade($oldversion) {
     if ($oldversion < 2011033101) {
         upgrade_plugin_savepoint(true, 2011033102, 'local', 'travis');
     }
+    return true;
 }

tests/Fixture/moodle-local_travis/db/upgrade.php

@@ -24,8 +24,15 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+/**
+ * Execute local_travis upgrade from the given old version.
+ *
+ * @param int $oldversion
+ * @return bool
+ */
 function xmldb_local_travis_upgrade($oldversion) {
     if ($oldversion < 2011033101) {
         upgrade_plugin_savepoint(true, 2011033101, 'local', 'travis');
     }
+    return true;
 }