Exit with a failure status if some tests failed

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>

tests/scripts/basic-build-test.sh

@@ -217,3 +217,7 @@ make clean
 if [ -f "$CONFIG_BAK" ]; then
     mv "$CONFIG_BAK" "$CONFIG_H"
 fi
+
+if [ $TOTAL_FAIL -ne 0 ]; then
+    exit 1
+fi