[paging] In expiration handling remove the request before doing the callback

Not doing this could lead to a double deletion due the paging
request being removed during the callback and afterwards as
well. Change the code to save the callback data, remove the
request, do the callback.

A patch was proposed by Andreas Eversberg and this one is
based on it.
1 file changed
tree: 30ac0d0942a5f035d5f55fae0ccf577cb932925b
  1. hlrsync/
  2. linux-kernel/
  3. openbsc/
  4. wireshark/