Fix memory leak in error handling.

theano/sandbox/cuda/cuda_ndarray.cu

@@ -328,6 +328,7 @@ PyObject * CudaNdarray_CreateArrayObj(CudaNdarray * self)
     if (CUBLAS_STATUS_SUCCESS != cublasGetError())
     {
         PyErr_SetString(PyExc_RuntimeError, "error copying data to host");
+        Py_DECREF(contiguous_self);
         Py_DECREF(rval);
         rval = NULL;
     }