better detection of failure

Former-commit-id: 08687608393d4df8f37303bb2e50d547053b9841

cicd_tests/test_fib.sh

@@ -38,7 +38,7 @@ do_test()
 
 	cmp out correct
 	res=$?
-	if [[ $? != 0 ]]; then
+	if [[ $res != 0 ]]; then
 		echo "detected output diff:"
 		diff out correct
 		exit 1

cicd_tests/test_foo.sh

@@ -27,7 +27,7 @@ do_test()
 
 	cmp out correct
         res=$?
-        if [[ $? != 0 ]]; then
+        if [[ $res != 0 ]]; then
                 echo "detected output diff:"
                 diff out correct
                 exit 1