libabis: fix segfault on malformed ipaccess RSL link

This patch fixes a segfault that occured when a ipaccess RSL link gets
closed unexpectedly.
The segfault can be provoked by connecting to the RSL port with ncat and
hitting ^C.
1 file changed
tree: 3ee83c5a36d41276ecfc7ee041d5ff6fe2aadf83
  1. hlrsync/
  2. linux-kernel/
  3. openbsc/
  4. wireshark/
  5. README