net/wan/fsl_ucc_hdlc: Avoid double free in ucc_hdlc_probe()

This patch fixes potential double frees if register_hdlc_device() fails.

Signed-off-by: Wen Yang <[e-mail]>
Reviewed-by: Peng Hao <[e-mail]>
CC: Zhao Qiang <[e-mail]>
CC: "David S. Miller" <[e-mail]>
CC: [e-mail]
CC: [e-mail]
CC: [e-mail]
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/wan/fsl_ucc_hdlc.c

···
 	if (register_hdlc_device(dev)) {
 		ret = -ENOBUFS;
 		pr_err("ucc_hdlc: unable to register hdlc device\n");
-		free_netdev(dev);
 		goto free_dev;
 	}