Fix typos

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Change-Id: Ia5ed00c488b0719b2bdd6c8f304900511684f445
Reviewed-on: https://review.coreboot.org/c/flashrom/+/38477


Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Nico Huber <nico.h@gmx.de>