nat: Fix thinko... use the right fd to determine the IP of the bts

Use the fd of the BSC Connection to determine the IP address of the
BTS as we are seeing it.
1 file changed
tree: 0fda23cd035aa78e7f0dd2eb969b4635ec149714
  1. hlrsync/
  2. linux-kernel/
  3. openbsc/
  4. wireshark/