test_sdp_termination()

struct gsm_mncc:
empty SDP: len=1860 sdplen=1026 sdp="\0" rc=0
empty SDP, shortest possible: len=835 sdplen=1 sdp="\0" rc=0
empty SDP, zero len: len=834 sdplen=0 sdp=- rc=-22
terminated SDP str: len=1860 sdplen=1026 sdp="Privacy is a desirable marketing option\0" rc=0
terminated SDP str, shortest possible: len=874 sdplen=40 sdp="Privacy is a desirable marketing option\0" rc=0
terminated SDP str, but len excludes nul: len=873 sdplen=39 sdp="Privacy is a desirable marketing option" rc=-22
terminated SDP str, but len too short: len=857 sdplen=23 sdp="Privacy is a desirable " rc=-22
len way too short: len=10 sdplen=-824 sdp=- rc=-22
len zero: len=0 sdplen=-834 sdp=- rc=-22

struct gsm_mncc_rtp:
empty SDP: len=1048 sdplen=1024 sdp="\0" rc=0
empty SDP, shortest possible: len=25 sdplen=1 sdp="\0" rc=0
empty SDP, zero len: len=24 sdplen=0 sdp=- rc=-22
terminated SDP str: len=1048 sdplen=1024 sdp="Privacy is a desirable marketing option\0" rc=0
terminated SDP str, shortest possible: len=64 sdplen=40 sdp="Privacy is a desirable marketing option\0" rc=0
terminated SDP str, but len excludes nul: len=63 sdplen=39 sdp="Privacy is a desirable marketing option" rc=-22
terminated SDP str, but len too short: len=47 sdplen=23 sdp="Privacy is a desirable " rc=-22
len way too short: len=10 sdplen=-14 sdp=- rc=-22
len zero: len=0 sdplen=-24 sdp=- rc=-22