[-1.12]amqp: handle potential overflows when dissecting amqp_0_10 PDUs

Ping Bug 10582
Change-Id: I6676133b80805295ea192f5a26818492d6e63531
Reviewed-on: https://code.wireshark.org/review/5186
Reviewed-by: Bill Meier <wmeier@newsguy.com>