bsc_api: Only forward L3 messages when the channel is active

Avoid forwarding messages from a channel that is already being
closed. Harald has forwarded a crash report where this was failing.
1 file changed
tree: 003b5887c489bd6ffa208aee9106a29d53b93930
  1. hlrsync/
  2. linux-kernel/
  3. openbsc/
  4. wireshark/