util/cbfstool: Fix to build with latest llvm

cbfs-payload-linux.c:255:43: note: add parentheses around left
hand side expression to silence this warning

if ((hdr->protocol_version >= 0x200) && (!hdr->loadflags & 1)) {

[pg: also fix the semantics. Thanks Nico for catching this]

BUG=chromium:665657
TEST=coreboot-utils builds

Change-Id: I025c784330885cce8ae43c44f9d938394af30ed5
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 35c4935f2a89c3d3b45213372bcf0474a60eda43
Original-Change-Id: I8758e7d158ca32e87107797f2a33b9d9a0e4676f
Original-Reviewed-on: https://chromium-review.googlesource.com/411335
Original-Commit-Ready: Manoj Gupta <manojgupta@chromium.org>
Original-Tested-by: Manoj Gupta <manojgupta@chromium.org>
Original-Reviewed-by: Mike Frysinger <vapier@chromium.org>
Reviewed-on: https://review.coreboot.org/17568
Tested-by: build bot (Jenkins)
Reviewed-by: Nico Huber <nico.h@gmx.de>
1 file changed