gprs: Subtract the headroom for what we can receive

The buffer got allocated with headroom and we need to
subtract that from the size of the buffer.
1 file changed
tree: abc7397804fd0b7aef60010e2e8393aa6adc5b84
  1. hlrsync/
  2. libosmocore/
  3. linux-kernel/
  4. openbsc/
  5. rrlp-ephemeris/
  6. wireshark/