tcpdump: Infinite loop due to a bug in print-resp.c:resp_get_length() in RESP parser

The RESP parser in tcpdump before 4.9.2 could enter an infinite loop due to a bug in print-resp.c:respgetlength...

UBUNTU-CVE-2017-12989

The RESP parser in tcpdump before 4.9.2 could enter an infinite loop due to a bug in print-resp.c:respgetlength...