[media] cec: return -EPERM when no LAs are configured

The CEC_TRANSMIT ioctl now returns -EPERM if an attempt is made to
transmit a message for an unconfigured adapter (i.e. userspace
never called CEC_ADAP_S_LOG_ADDRS).

This differentiates this case from when LAs are configured, but no
physical address is set. In that case -ENONET is returned.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/cec/cec-api.c

@@ -198,7 +198,9 @@ static long cec_transmit(struct cec_adapter *adap, struct cec_fh *fh,
 		return -EINVAL;
 
 	mutex_lock(&adap->lock);
-	if (adap->is_configuring)
+	if (adap->log_addrs.num_log_addrs == 0)
+		err = -EPERM;
+	else if (adap->is_configuring)
 		err = -ENONET;
 	else if (!adap->is_configured && (msg.msg[0] != 0xf0 || msg.reply))
 		err = -ENONET;