mscsplit: directly access gsm_network backpointer from gsm_subscriber_connection

The previous commit added a network backpointer to gsm_subscriber_connection.
Use it wherever it makes sense, to skip the step through the bts structure.

In some places, remove local variables that become unused.

Change-Id: I34537025986713291e14c8212a81539b497befd4
5 files changed
tree: 68b573589faafcbe7016e390c6f7a995535d7c29
  1. contrib/
  2. debian/
  3. openbsc/
  4. .gitignore
  5. .gitreview
  6. .mailmap