Void pointer arithmetics are forbidden in standard C but GCC has
an extension that allows it.
Change-Id: I43029b2ab2f7709b8e1ba85eb05c31341b8ac16f
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/18293
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins)
Reviewed-by: Nico Huber <nico.h@gmx.de>