[riot-notifications] [RIOT-OS/RIOT] nanocoap: fix server-side option_count overflow (#10754)

Kaspar Schleiser notifications at github.com
Mon Jan 14 11:49:37 CET 2019

> The only remaining question for me is why are there 42 options in guard_data instead of only one or two. When I allowed the parse to overwrite the guard data, I found the overwrite occurred in the first few bytes.

@nmeum provided this packet in his original report, and I was lazy enough to take it as-is. The number just needs to be higher than ```NANOCOAP_NOPT_MAX```. (42 seemed to be the right answer after thinking for 7.5 million years.) I've added a note stating that 42 is basically randomly chosen.

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