lib.sh: stricter check in chkvars()

testing +x is all well and good, but the variable string
may be empty, even if set. some of the checks in the build
system are relying on the latter, so handle it.

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

1 files changed, 1 insertions, 0 deletions

diff --git a/include/lib.sh b/include/lib.sh
index 58aa8d46..e6a998d2 100755
--- a/include/lib.sh
+++ b/include/lib.sh
@@ -33,6 +33,7 @@ chkvars()
 {
 	for var in $@; do
 		eval "[ -n "\${$var+x}" ] || \$err \"$var unset\""
+		eval "[ -n "\$$var" ] || \$err \"$var unset\""
 	done; return 0
 }