Diffusion FreeBSD src repository 6204a90c0b8b

Adjust nvd_{load,unload}() definitions to avoid clang 15 warnings
6204a90c0b8b
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Description

Adjust nvd_{load,unload}() definitions to avoid clang 15 warnings

With clang 15, the following -Werror warnings are produced:

sys/dev/nvd/nvd.c:150:9: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
nvd_load()
        ^
         void
sys/dev/nvd/nvd.c:166:11: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
nvd_unload()
          ^
           void

This is because nvd_load() and nvd_unload() are declared with a (void)
argument list, but defined with an empty argument list. Make the
definitions match the declarations.

MFC after: 3 days

(cherry picked from commit c46c9b3f5f1eb5575a5e42f52872dbea9cf7516f)