Fix a possible segfault in heim::net::nic() for Windows #336
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A null pointer here means "no interface", not an error. An error is signalled by res != NO_ERROR
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Hello,
After some time using
heim::net::nic()on Windows (which I implemented some time ago in ad69138), I realized I introduced a potential null pointer dereferencing 馃槰I've actually ran into this in some tests of mine, that segfaulted when an adapter had not been assigned any IP address.
This MR fixes this issue by properly checking for null pointers where I had forgotten to do so.
Luckily, this bug has never reached a tagged version nor a published version of the
heimcrate incrates.io