[paging] Use paging_request_remove to update last_request and free memory

Update the last_request when stopping the paging operation and also
free the associated memory of the request.

tree: 5984ab62e5fcb3cccd4d68655f6d8377f139fe91
  1. tests/
  2. tools/
  3. AUTHORS
  4. configure.in
  5. COPYING
  6. Makefile.am
  7. README