init.d/hostname: Document checkbashism false positive.
init.d/hostname: Document checkbashism false positive.

Signed-off-by: Robin H. Johnson <aa3b04a87f185a8b919ce94fe21b810489ffb8d4@gentoo.org>

williamh/openrc,dwfreed/openrc,OpenRC/openrc,williamh/openrc,OpenRC/openrc,williamh/openrc,dwfreed/openrc,dwfreed/openrc,OpenRC/openrc