mgcp: Fix memory leak in the transcoding code

The GSM handle was never released. This was found using valgrind
and the leak check.

==14933== 752 bytes in 1 blocks are definitely lost in loss record 15 of 19
==14933==    at 0x4028B4C: malloc (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==14933==    by 0x4130201: gsm_create (in /usr/lib/i386-linux-gnu/libgsm.so.1.0.12)
==14933==    by 0x80517AE: mgcp_transcoding_setup (mgcp_transcode.c:199)
==14933==    by 0x8049691: given_configured_endpoint.isra.1 (mgcp_transcoding_test.c:198)
==14933==    by 0x8049C11: test_transcode_result (mgcp_transcoding_test.c:328)
==14933==    by 0x8049418: main (mgcp_transcoding_test.c:582)
1 file changed
tree: 5908647b7e7cb90221ead6851ce0bfe6e543067c
  1. debian/
  2. hlrsync/
  3. linux-kernel/
  4. openbsc/
  5. wireshark/
  6. README