Diffusion FreeBSD src repository 5278592355a2

Adjust function definitions in kern_cons.c to avoid clang 15 warnings
5278592355a2
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Description

Adjust function definitions in kern_cons.c to avoid clang 15 warnings

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

sys/kern/kern_cons.c:201:14: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
cninit_finish()
             ^
              void
sys/kern/kern_cons.c:376:7: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
cngrab()
      ^
       void
sys/kern/kern_cons.c:389:9: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
cnungrab()
        ^
         void
sys/kern/kern_cons.c:402:9: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
cnresume()
        ^
         void

This is because cninit_finish(), cngrab(), cnungrab(), and cnresume()
are declared with (void) argument lists, but defined with empty argument
lists. Make the definitions match the declarations.

MFC after: 3 days

(cherry picked from commit 9806e82a23924f32dc5976bc8687fbbe293a140b)