Fix some instances where we left db connections open (registration -> captcha for example)

git-svn-id: file:///svn/phpbb/branches/phpBB-3_0_0@8655 89ea8834-ac86-4346-8a33-228a782c2dd0

phpBB/includes/ucp/ucp_confirm.php

@@ -73,7 +73,9 @@ class ucp_confirm
 
 		$captcha = new captcha();
 		$captcha->execute($row['code'], $row['seed']);
-		exit;
+
+		garbage_collection();
+		exit_handler();
 	}
 }