move search for existing lchan for subscriber to new function

There's now a new function called 'lchan_for_subscr()' which can be
used to determine if there is any existing lchan for this subscriber.
3 files changed
tree: 2a03c898bb2a690ed259655258cfcbcd24909dfe
  1. linux-kernel/
  2. openbsc/
  3. wireshark/