mgcp_test: fix wrong strcmp() parameters

The CRCX string parameter lacks the quotes and the result of
the function call is not checked against zero. Also the
return code of get_conn_id_from_response() is not asserted.

Fixes: Coverity CID#180534

Change-Id: If4f3ed2c3572da196160569a9705b7a302b700a9
1 file changed