[paging] Do not create a request when one is already pending...

This is removing a memleak, saving some mallocs and a crash
in the timer expired function that attempted to remove the
paging_request from a list it was not in....
tree: b50de08a1e0465d381e0765ebf062e24d7f886fe
  1. tests/
  2. tools/
  3. AUTHORS
  4. configure.in
  5. COPYING
  6. Makefile.am
  7. README