Diffusion FreeBSD src repository a9aa00437bd8

Adjust function definitions in if_pfsync.c to avoid clang 15 warnings
a9aa00437bd8
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Description

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

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

sys/netpfil/pf/if_pfsync.c:2439:21: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
pfsync_pointers_init()
                    ^
                     void
sys/netpfil/pf/if_pfsync.c:2453:23: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
pfsync_pointers_uninit()
                      ^
                       void
sys/netpfil/pf/if_pfsync.c:2503:12: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
pfsync_init()
           ^
            void
sys/netpfil/pf/if_pfsync.c:2524:14: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
pfsync_uninit()
             ^
              void

This is because pfsync_pointers_init(), pfsync_pointers_uninit(),
pfsync_init(), and pfsync_uninit() 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 766f3c8032a95f344823bea70bb7f794f9939d33)