wolfssl: silence compiler warning (MSVC 2019), simplify existing #16230
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Seen with VS2019 and older versions:
Ref: https://github.com/curl/curl/actions/runs/13190321645/job/36821938202?pr=16217#step:9:30
Also replace pragma suppression with this simpler method, and silence
checksrc
where it complains about the extra!= NULL
this needs.