Fix a big memory leak in CudaNdArray_setItem (and a smaller one in zeros)

theano/sandbox/cuda/cuda_ndarray.cu

@@ -311,6 +311,7 @@ PyObject* CudaNdarray_Zeros(PyObject* dummy, PyObject* shape)
         }
 
         int shp_el = PyInt_AsLong(shp_el_obj);
+        Py_DECREF(shp_el_obj);
 
         if (shp_el <= 0)
         {
@@ -320,7 +321,6 @@ PyObject* CudaNdarray_Zeros(PyObject* dummy, PyObject* shape)
         }
 
         newdims[i] = shp_el;
-        
         total_elements *= newdims[i];
     }
 
@@ -1395,7 +1395,10 @@ CudaNdarray_setitem(PyObject *o, PyObject  *key, PyObject  *v)
     assert (CudaNdarray_EqualAndIgnore(viewCopyForComparison, rval, 1, 1));
     assert (rval->base == baseSavedForComparison);
     assert (rval->dev_structure_fresh);
+
+    // Clean up locally-created references
     Py_DECREF((PyObject*)viewCopyForComparison);
+    Py_DECREF(rval);
 
     return 0;
 }