domainname(1) - make usage __dead

[Gleydson Soares]

make usage() __dead and static, while here switch main to return instead of exit(3)

[Ted Unangst]

-void
+__dead static void
usage(void)
{
(void)fprintf(stderr, "usage: %s [name-of-domain]\n", __progname);

do we have a preferred order for these words? i always use static void __dead
because i like the real C keywords first, then the annotations to follow.
starting the line with __ creates "glare". i don't know. not a big deal, just
throwing it out there.

[Todd C. Miller]

Post by Ted Unangst
do we have a preferred order for these words? i always use static void __dead
because i like the real C keywords first, then the annotations to follow.
starting the line with __ creates "glare". i don't know. not a big deal, just
throwing it out there.

Most code in the tree uses "static __dead void" which is what I
prefer.

- todd