general code cleanup in shell scripts

Signed-off-by: Leah Rowe <leah@libreboot.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/script/build/coreboot/utils b/script/build/coreboot/utils
index 75827d86..e3d471ad 100755
--- a/script/build/coreboot/utils
+++ b/script/build/coreboot/utils
@@ -21,9 +21,9 @@ main()
 build_for_mainboard() {
 	[ -f "config/coreboot/${1}/target.cfg" ] || \
 		err "build_for_mainboard ${1}: target.cfg does not exist"
-	tree="undefined"
+	tree=""
 	. "config/coreboot/${1}/target.cfg" # source
-	[ "${tree}" = "undefined" ] && \
+	[ -z ${tree} ] && \
 		err "build_for_mainboard ${1}: improper tree definition"
 	buildutils "${tree}"
 }