trau_mux.c: Prevent out-of-bounds read in trau_decode_fr()

Haralds patch in 9f109dfb9926558b6ea504dc3aee92cfd64413bd only fixed
the trau_encode_fr part but the issue seems to exist in the decode
function as well. Apply the same fix.
1 file changed
tree: c2695d6776e2568fa6bdfe60a9295580b04fa2d6
  1. debian/
  2. hlrsync/
  3. linux-kernel/
  4. openbsc/
  5. wireshark/
  6. README