Fix mysqli_release_savepoint() on mysqlnd

mysqli_release_savepoint() was not actually releasing a savepoint...

Author: nikic

ext/mysqli/mysqli_nonapi.c

@@ -1234,7 +1234,7 @@ PHP_FUNCTION(mysqli_release_savepoint)
 #if !defined(MYSQLI_USE_MYSQLND)
 	if (mysqli_savepoint_libmysql(mysql->mysql, name, TRUE)) {
 #else
-	if (FAIL == mysqlnd_savepoint(mysql->mysql, name)) {
+	if (FAIL == mysqlnd_release_savepoint(mysql->mysql, name)) {
 #endif
 		RETURN_FALSE;
 	}

ext/mysqli/tests/mysqli_release_savepoint.phpt

@@ -50,7 +50,7 @@ if (!have_innodb($link))
 		printf("[009] Cannot turn off autocommit, expecting true, got %s/%s\n", gettype($tmp), $tmp);
 
 	/* note that there is no savepoint my... */
-	if (true !== ($tmp = mysqli_release_savepoint($link, 'my')))
+	if (false !== ($tmp = mysqli_release_savepoint($link, 'my')))
 		printf("[010] Got %s - [%d] %s\n", var_dump($tmp, true), mysqli_errno($link), mysqli_error($link));
 
 	if (!mysqli_query($link, 'INSERT INTO test(id) VALUES (1)'))