Update based on review.

Author: MartinPavella

backends/nxp/backend/ir/converter/node_converter.py

@@ -196,7 +196,7 @@ def _has_shared_q_params_if_quantized(node: Node) -> bool:
     def is_node_alone_in_partition(
         node: Node,
         partition_list: list[Partition],
-        filter_fn: Callable[[Node], bool] | None = None,
+        filter_fn: Callable[[Node], bool] = is_not_qdq_node,
     ) -> bool:
         """Return True if `node` is the only node in its partition for which `filter_fn`
         returns True.
@@ -210,9 +210,6 @@ def is_node_alone_in_partition(
         :param filter_fn: Predicate applied to nodes in the partition. `node` is considered alone if it is the only node
                            for which this predicate returns True. By default, Q/Dq nodes are ignored.
         """
-        if filter_fn is None:
-            filter_fn = is_not_qdq_node
-
         partitions = [p for p in partition_list if node in p.nodes]
         if len(partitions) != 1:
             raise ValueError(