[BUGFIX] deepseek-v2-lite failed due to fused_qkv_a_proj name update (#21414)

Signed-off-by: Chendi.Xue <[email protected]>

Author: xuechendi

vllm/model_executor/models/deepseek_v2.py

@@ -885,13 +885,16 @@ def load_weights(self, weights: Iterable[tuple[str,
                 # for mlp.experts[0].gate_gate_up_proj, which breaks load.
                 if (("mlp.experts." in name) and name not in params_dict):
                     continue
-                name = name.replace(weight_name, param_name)
+                name_mapped = name.replace(weight_name, param_name)
 
                 # QKV fusion is optional, fall back to normal
                 # weight loading if it's not enabled
+                # if go with fusion option, then update name
                 if ((param_name == "fused_qkv_a_proj")
-                        and name not in params_dict):
+                        and name_mapped not in params_dict):
                     continue
+                else:
+                    name = name_mapped
                 # Skip loading extra bias for GPTQ models.
                 if name.endswith(".bias") and name not in params_dict:
                     continue