fix bug

Author: zewenli98

py/torch_tensorrt/dynamo/_engine_caching.py

@@ -39,7 +39,7 @@ def get_hash(gm: torch.fx.GraphModule) -> str:
             for name, param in new_gm.named_parameters():
                 param.data.zero_()
 
-            hash_val = cast(str, FxGraphCachePickler.get_hash(gm))
+            hash_val = cast(str, FxGraphCachePickler.get_hash(new_gm))
 
         return hash_val