remove redundant logging from longformer (#30365)

src/transformers/models/longformer/modeling_longformer.py

@@ -1593,7 +1593,7 @@ class LongformerModel(LongformerPreTrainedModel):
         # this path should be recorded in the ONNX export, it is fine with padding_len == 0 as well
         if padding_len > 0:
             logger.warning_once(
-                f"Input ids are automatically padded from {seq_len} to {seq_len + padding_len} to be a multiple of "
+                f"Input ids are automatically padded to be a multiple of "
                 f"`config.attention_window`: {attention_window}"
             )
             if input_ids is not None: