media: dvb-frontends: mb86a16.c: always use the same error path

If the message length was wrong, the dprintk() after the 'err' label
was bypassed. Fix that, and fix a smatch warning at the same time:

mb86a16.c:1514 mb86a16_send_diseqc_msg() warn: missing unwind goto?
Signed-off-by: NHans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: NMauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/dvb-frontends/mb86a16.c

@@ -1498,6 +1498,7 @@ static int mb86a16_send_diseqc_msg(struct dvb_frontend *fe,
 				   struct dvb_diseqc_master_cmd *cmd)
 {
 	struct mb86a16_state *state = fe->demodulator_priv;
+	int ret = -EREMOTEIO;
 	int i;
 	u8 regs;
 
@@ -1510,8 +1511,10 @@ static int mb86a16_send_diseqc_msg(struct dvb_frontend *fe,
 
 	regs = 0x18;
 
-	if (cmd->msg_len > 5 || cmd->msg_len < 4)
-		return -EINVAL;
+	if (cmd->msg_len > 5 || cmd->msg_len < 4) {
+		ret = -EINVAL;
+		goto err;
+	}
 
 	for (i = 0; i < cmd->msg_len; i++) {
 		if (mb86a16_write(state, regs, cmd->msg[i]) < 0)
@@ -1532,7 +1535,7 @@ static int mb86a16_send_diseqc_msg(struct dvb_frontend *fe,
 
 err:
 	dprintk(verbose, MB86A16_ERROR, 1, "I2C transfer error");
-	return -EREMOTEIO;
+	return ret;
 }
 
 static int mb86a16_send_diseqc_burst(struct dvb_frontend *fe,