Fix off-by-one error in write_spi_flash_page()

Change-Id: Ifa8471efa6c10ec462dc2e352224ef2812ab1808
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: http://review.coreboot.org/11458
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
1 file changed