Modifies a pointer to a Query to point to a different Query.
This function is similar to gst_query_replace except that it takes ownership of new_query.
Either new_query or the Query pointed to by old_query may be
null.
| old_query |
pointer to a pointer to a Query to be stolen. |
| new_query |
pointer to a Query that will replace the query pointed to by |
|
true if |