usage.c API users: use die_message() for error() + exit 128

Continue the migration of code that printed a message and exited with
128. In this case the caller used "error()", so we'll be changing the
output from "error: " to "fatal: ". This change is intentional and
desired.

This code is dying, so it should emit "fatal", the only reason it
didn't do so was because before the existence of "die_message()" it
would have needed to craft its own "fatal: " message.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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