Revert "Fix Whisper CI (#34541)"

This reverts commit eb81144.

Author: ydshieh

src/transformers/generation/utils.py

@@ -1452,11 +1452,10 @@ def _prepare_generated_length(
         ):
             generation_config.max_length -= inputs_tensor.shape[1]
         elif has_default_max_length:  # by default let's always generate 20 new tokens
-            if generation_config.max_length == GenerationConfig().max_length:
-                generation_config.max_length = generation_config.max_length + input_ids_length
-                max_position_embeddings = getattr(self.config, "max_position_embeddings", None)
-                if max_position_embeddings is not None:
-                    generation_config.max_length = min(generation_config.max_length, max_position_embeddings)
+            generation_config.max_length = generation_config.max_length + input_ids_length
+            max_position_embeddings = getattr(self.config, "max_position_embeddings", None)
+            if max_position_embeddings is not None:
+                generation_config.max_length = min(generation_config.max_length, max_position_embeddings)
 
         # same for min length
         if generation_config.min_new_tokens is not None: