RFR(S): 8252407: Build failure with gcc-8+ and asan

[Florian Weimer]

* Kim Barrett:

> And strlen is not even necessarily the best solution, as it likely
> introduces an additional otherwise unnecessary string traversal. For
> example, getFlags could be changed to reject an overly long ifname,
> without using strlen, thusly:
>
>     strncpy(if2.ifr_name, ifname, sizeof(if2.ifr_name));
>     if (if2.ifr_name[sizeof(if2.ifr_name) - 1] != '\0') {
>         return -1;
>     }
>
> Unfortunately, gcc10 -Wstringop-truncation whines about this entirely
> reasonable code.

Thanks, I filed this as: <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96951>

Florian
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