Fix wrong parenteses in runtest.c

tests/runtest.c

@@ -89,7 +89,7 @@ main(int argc, char * argv[])
         if (_setUp && NULL != tearDown) {
             int _tearDown = tearDown();
 
-            if ((! TEST_OK == _tearDown) && TEST_OK == result) {
+            if ((!(TEST_OK == _tearDown)) && TEST_OK == result) {
                 result = _tearDown;
             }
         }