rtspsrc: Fix segfault with illegal free
set_get_param_q is not a pointer so it is illegal to call g_queue_free_full(). It is enough to clear the queue with g_queue_clear_full() to free all the allocated data.
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set_get_param_q is not a pointer so it is illegal to call g_queue_free_full(). It is enough to clear the queue with g_queue_clear_full() to free all the allocated data.