- Call g_queue_insert_sorted() instead of duplicating the code. - Call

- Call g_queue_insert_sorted() instead of duplicating the code. - Call

* glib/gasyncqueue.c:
- Call g_queue_insert_sorted() instead of duplicating the code.
- Call g_queue_sort() instead of duplicating the code.
- Invert sort function results to make sure the same sort function
gives the same results across glist, gslist, gqueue and
gasyncqueue.

* tests/asyncqueue-test.c:
- Updated the sort function to reflect the example in the
documentation for gasyncqueue.c.