net/wan/fsl_ucc_hdlc: allow ucc index up to 7

There is a need to allow higher indexes to be
able to support MPC83xx platforms. (UCC1-UCC8)

Signed-off-by: David Gounaris <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/wan/fsl_ucc_hdlc.c

···
 	}
 
 	ucc_num = val - 1;
-	if ((ucc_num > 3) || (ucc_num < 0)) {
+	if (ucc_num > (UCC_MAX_NUM - 1) || ucc_num < 0) {
 		dev_err(&pdev->dev, ": Invalid UCC num\n");
 		return -EINVAL;
 	}