[Bug 255936] syscall module example fails to compile

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255936

            Bug ID: 255936
           Summary: syscall module example fails to compile
           Product: Documentation
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Manual Pages
          Assignee: bugs at FreeBSD.org
          Reporter: splitface at mailfence.com
                CC: doc at FreeBSD.org

I tried to compile the example but I got this error:

syscall.c:55:2: error: incompatible function pointer types initializing
'systrace_args_func_t' (aka 'void (*)(int, void *, unsigned long *, int *)')
with an expression of type 'int (struct thread *, void *)'
[-Werror,-Wincompatible-function-pointer-types]
        hello                   /* sy_call */
        ^~~~~
1 error generated.
*** Error code 1


the 'struct sysent' is different in FreeBSD 13 STABLE

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