openbsc: Fix coverity issues

This patch (hopefully) fixes the new defects reported by coverity.

Addresses:
** CID 1156986:  Negative array index read  (NEGATIVE_RETURNS)
/tests/gsm0408/gsm0408_test.c: 419 in test_si_range_helpers()
/tests/gsm0408/gsm0408_test.c: 423 in test_si_range_helpers()
/tests/gsm0408/gsm0408_test.c: 427 in test_si_range_helpers()

** CID 1156987:  Unchecked return value from library
(CHECKED_RETURN)
/src/libmgcp/mgcp_protocol.c: 1150 in mgcp_keepalive_timer_cb()

** CID 1156988:  Unchecked return value from library
(CHECKED_RETURN)
/src/libmgcp/mgcp_protocol.c: 983 in handle_modify_con()

Sponsored-by: On-Waves ehf
2 files changed
tree: f022e6d13dd489ccb8cb04198a68053c7816dc9c
  1. debian/
  2. hlrsync/
  3. linux-kernel/
  4. openbsc/
  5. wireshark/
  6. README