link-layer print routines if no other print routine claimed the packet.
Test whether that flag is set rather than testing whether neither of -x
or -q were specified, and have -x, -q, *and* -X set that flag, so that
-X suppresses it just as -x does. That way you don't get those pckets
dumped twice if -X was specified.
We don't have source or destination MAC addresses in the Axent/Symantec
firewall capture file, so we don't print them - therefore, we shouldn't
put ", " before the Ethernet type.
