Diffusion FreeBSD src repository 823283ab45b8

Adjust function definitions in netipsec's key.c to avoid clang 15 warnings
823283ab45b8
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Description

Adjust function definitions in netipsec's key.c to avoid clang 15 warnings

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

sys/netipsec/key.c:6432:15: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
key_getcomb_ah()
              ^
               void
sys/netipsec/key.c:6489:19: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
key_getcomb_ipcomp()
                  ^
                   void

This is because key_getcomb_ah() and key_getcomb_ipcomp() 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 8bd2887be5105010e73fc35ddd25021e186811b8)