GCC 7.1 found an int-in-bool-context in northbridgeinit.c. The logical `&&` in `if (shadowByte && (1 << bit))` should be changed to bitwise `&`. Also fix off-by-one error with the bitmasks. Change-Id: I7d7720121d4730254542372282f5561739e7214b Signed-off-by: Iru Cai <mytbk920423@gmail.com> Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Reviewed-on: https://review.coreboot.org/20808 Reviewed-by: Piotr Król <piotr.krol@3mdeb.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>