[GPRS] LLC: Improve implementation compliance to spec

Don't allocate a LLC Entity just because BSSGP passes any random
SAPI/TLLI up to us.  We can only do this for XID and UI frames
of the GMM SAPI.

Furthermore, add more comments and debug messages.
2 files changed
tree: dff9104078156557157efb0cfae87be299f455e9
  1. hlrsync/
  2. libosmocore/
  3. linux-kernel/
  4. openbsc/
  5. rrlp-ephemeris/
  6. wireshark/