Fix import

Author: gmarkall

numba_cuda/numba/cuda/tests/cudapy/test_device_func.py

@@ -3,10 +3,11 @@
 
 import numpy as np
 
-from numba.cuda.testing import (skip_on_cudasim, skip_unless_cffi,
-                                test_data_dir, unittest, CUDATestCase)
+from numba.cuda.testing import (skip_on_cudasim, test_data_dir, unittest,
+                                CUDATestCase)
 from numba import cuda, jit, float32, int32, types
 from numba.core.errors import TypingError
+from numba.tests.support import skip_unless_cffi
 from types import ModuleType