fix pylint

Author: RandyShuai

tf2onnx/onnx_opset/nn.py

@@ -289,7 +289,7 @@ def version_1(cls, ctx, node, **kwargs):
         node.set_attr("kernel_shape", [k_h, k_w])
         strides = conv_dims_attr(node, "strides")
         conv_dims_attr(node, "dilations")
-        node.set_attr("group", k_input_channels )
+        node.set_attr("group", k_input_channels)
         add_padding(ctx, node, kernel_shape, strides)
 
         new_kernel_shape = [k_h, k_w, 1, k_output_channels]