Fix coreboot-utils 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)) {

BUG=chromium:665657
TEST=coreboot-utils builds

Change-Id: I8758e7d158ca32e87107797f2a33b9d9a0e4676f
Reviewed-on: https://chromium-review.googlesource.com/411335
Commit-Ready: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
diff --git a/util/cbfstool/cbfs-payload-linux.c b/util/cbfstool/cbfs-payload-linux.c
index afb0f3a..ac7e729 100644
--- a/util/cbfstool/cbfs-payload-linux.c
+++ b/util/cbfstool/cbfs-payload-linux.c
@@ -252,7 +252,7 @@
 	}
 
 	unsigned long kernel_base = 0x100000;
-	if ((hdr->protocol_version >= 0x200) && (!hdr->loadflags & 1)) {
+	if ((hdr->protocol_version >= 0x200) && (!hdr->loadflags)) {
 		kernel_base = 0x1000; /* zImage kernel */
 	}
 	/* kernel prefers an address, so listen */