mbuto: kselftests: $__colls might have multiple tokens

Quote it, when checking if it's empty.

Fixes: 2584ae2bd68b ("mbuto: kselftests: Fill in collections if none are given")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/mbuto b/mbuto
index 88755c5..81abba2 100755
--- a/mbuto
+++ b/mbuto
@@ -216,7 +216,7 @@ profile_kselftests() {
 		__colls="${__c} ${__colls}"
 	done
 
-	if [ -z ${__colls} ]; then
+	if [ -z "${__colls}" ]; then
 		__colls="$(${SED} -n 's/^TARGETS += \(.*\)$/\1/p' \
 			   "${__makefile}")"
 	fi