fix two segfaults

* when paging callback is called, we need to consider a failed paging
  operation (i.e. lchan == NULL)
* we have to zero-initialize every transaction that is allocated
1 file changed
tree: 6a775a2bcf01b385199da969eed48f029962dbfd
  1. linux-kernel/
  2. openbsc/
  3. wireshark/