samples/seccomp: Adjust sample to also provide kill option

As a quick way to test SECCOMP_RET_KILL, have a negative errno mean to
kill the process.

While we're in here, also swap the arch and syscall arguments so they're
ordered more like how seccomp filters order them.

Signed-off-by: Kees Cook <keescook@chromium.org>
1 file changed