Ensure device_lib_test only runs GPU code when a GPU is available.

Change: 145342535

tensorflow/python/client/device_lib_test.py

@@ -32,7 +32,7 @@ class DeviceLibTest(test_util.TensorFlowTestCase):
     self.assertEqual(devices[0].device_type, "CPU")
 
     # GPU test
-    if test.is_built_with_cuda():
+    if test.is_gpu_available():
       self.assertGreater(len(devices), 1)
       self.assertTrue("GPU" in [d.device_type for d in devices])