moved derefs to be called as soon as var is no longer needed

src/ale.cpp

@@ -340,6 +340,9 @@ namespace ale {
 
      // Call the function with the arguments.
      PyObject* pResult = PyObject_CallObject(pFunc, pArgs);
+     Py_DECREF(pArgs);
+     Py_DECREF(pFunc);
+     Py_DECREF(pString);
      if(!pResult) {
         throw invalid_argument(getPyTraceback());
      }
@@ -355,13 +358,8 @@ namespace ale {
 
      char *temp_str = PyBytes_AS_STRING(temp_bytes); // Borrowed pointer
      cResult = temp_str; // copy into std::string
-     Py_DECREF(temp_str);
 
      Py_DECREF(pResultStr);
-     Py_DECREF(temp_bytes);
-     Py_DECREF(pArgs);
-     Py_DECREF(pModule);
-     Py_DECREF(pString);
 
      return cResult;
  }