Avoid cmyk in nvjpeg tests (#4246)

Author: NicolasHug

test/test_image.py

@@ -326,7 +326,8 @@ def test_decode_jpeg_cuda(mode, img_path, scripted):
 @pytest.mark.parametrize('cuda_device', ('cuda', 'cuda:0', torch.device('cuda')))
 def test_decode_jpeg_cuda_device_param(cuda_device):
     """Make sure we can pass a string or a torch.device as device param"""
-    data = read_file(next(get_images(IMAGE_ROOT, ".jpg")))
+    path = next(path for path in get_images(IMAGE_ROOT, ".jpg") if 'cmyk' not in path)
+    data = read_file(path)
     decode_jpeg(data, device=cuda_device)