fix cpu op

Author: jiqing-feng

vllm/_custom_ops.py

@@ -189,8 +189,6 @@ def fused_add_rms_norm(input: torch.Tensor, residual: torch.Tensor,
     ops = torch.ops._C_cpu if input.device.type == "cpu" else torch.ops._C
     ops.fused_add_rms_norm(input, residual, weight, epsilon)
 
-    torch.ops._C.fused_add_rms_norm(input, residual, weight, epsilon)
-
 
 def advance_step_flashattn(num_seqs: int, num_queries: int, block_size: int,
                            input_tokens: torch.Tensor,