[media] cxd2820r_t2: Fix a warning: stream_id is unsigned

drivers/media/dvb-frontends/cxd2820r_t2.c: In function 'cxd2820r_set_frontend_t2':
drivers/media/dvb-frontends/cxd2820r_t2.c:128:2: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb-frontends/cxd2820r_t2.c

@@ -125,7 +125,7 @@ int cxd2820r_set_frontend_t2(struct dvb_frontend *fe)
 	buf[2] = ((if_ctl >>  0) & 0xff);
 
 	/* PLP filtering */
-	if (c->stream_id < 0 || c->stream_id > 255) {
+	if (c->stream_id > 255) {
 		dev_dbg(&priv->i2c->dev, "%s: Disable PLP filtering\n", __func__);
 		ret = cxd2820r_wr_reg(priv, 0x023ad , 0);
 		if (ret)