Decref and remove reference to self->base when allocating new memory

theano/sandbox/cuda/cuda_ndarray.cuh

@@ -396,8 +396,13 @@ int CudaNdarray_alloc_contiguous(CudaNdarray *self, const int nd, const inttype
     {
         return 0;
     }
-    else
-    {
+
+    // The structure of self will be reused with newly allocated memory.
+    // If self was a view, we should remove the reference to its base.
+    // (If base was already NULL, the following has no effect.)
+    Py_XDECREF(self->base);
+    self->base = NULL;
+
     // If self is a view, do not try to free its memory
     if (self->data_allocated && device_free(self->devdata))
     {
@@ -421,7 +426,7 @@ int CudaNdarray_alloc_contiguous(CudaNdarray *self, const int nd, const inttype
             self->devdata,
             self);
     self->data_allocated = size;
-    }
+
     return 0;
 }