Description:
------------
"mysqli_multi_query" works fine when only using 1 statement, however when using more than 1 statement the function returns empty.

Reproduce code:
---------------
$query  = "SELECT * FROM database_name.first_table;";
$query .= "SELECT * FROM database_name.second_table";

/* execute multi query */
if (mysqli_multi_query($link, $query)) {
   do {
       /* store first result set */
       if ($result = mysqli_store_result($link)) {
           while ($row = mysqli_fetch_row($result)) {
               printf("%s\n", $row[0]);
           }
           mysqli_free_result($result);
       }
       /* print divider */
       if (mysqli_more_results($link)) {
           printf("-----------------\n");
       }
   } while (mysqli_next_result($link));
}

Expected result:
----------------
Works perfect when this line is taken out:

 $query .= "SELECT * FROM database_name.second_table";

But doesn't work when this line is kept in.