typo fix

theano/tensor/tests/test_opt.py

@@ -3554,6 +3554,7 @@ class test_assert(utt.InferShapeTester):
         assert topo[0].op == deep_copy_op, topo
 
         mode = compile.mode.get_default_mode()
+        a = theano.tensor.opt.assert_op(x, T.eq(x, 0).any())
         f = theano.function([x], a, mode=mode.excluding('unsafe'))
         topo = f.maker.fgraph.toposort()
         a_op = [n for n in topo if isinstance(n.op, T.opt.Assert)]