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

found by -fsanitize=address the last iteration of the loop, where i ==
259 and o == 260.  It is read out-of-bounds but the content is never
used.
1 file changed
tree: 468c95518bc12d1faf648a49a1688677baf6b3d2
  1. debian/
  2. hlrsync/
  3. linux-kernel/
  4. openbsc/
  5. wireshark/
  6. README