[nwam-dev] code review for 2 bugfixes

[Alan Maguire]

...namely

10090 nwamd faults accessing bad buffer in nwam_get_prop_value()
10691 Some IP match conditionals are toxic to nwamd

see:

http://zhadum.east/export/ws/amaguire/nwam1-fixes/webrev

Thanks!

Alan