Decref unused variables, even if the allocation failed.

theano/sandbox/cuda/cuda_ndarray.cu

@@ -2282,10 +2282,10 @@ filter(PyObject* __unsed_self, PyObject *args) // args = (data, broadcastable, s
                 Py_DECREF(rval);
                 rval = NULL;
             }
-            Py_DECREF(data);
-            Py_DECREF(py_data);
-            Py_DECREF(broadcastable);
         }
+        Py_DECREF(data);
+        Py_DECREF(py_data);
+        Py_DECREF(broadcastable);
         return (PyObject*)rval;
     }
 }