John Baldwin f4db390553 netmap tests: Reset ctx->nmctx to NULL in nmreq_parsing.
This avoids leaking a pointer to the on-stack test_nmctx which
triggers a -Wdangling-pointer warning from GCC.

Reviewed by:	imp, emaste
Differential Revision:	https://reviews.freebsd.org/D37536
2022-12-04 16:29:25 -08:00
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