media: dib0700: Only touch one bit when start/stop an adapter

Only touch the right bit to enable/disable an adapter channel,
without touching the other adapter's one.

Tested on Nova-TD.

Link: https://lore.kernel.org/linux-media/4214942f248baddec9cfd2b4b2424993ac356a51.1632689033.git.mchehab+huawei@kernel.org

Cc: linuxarm@huawei.com, mauro.chehab@huawei.com, Mauro Carvalho Chehab <mchehab+huawei@kernel.org>, Mauro Carvalho Chehab <mchehab@kernel.org>, Michael Kuron <michael.kuron@gmail.com>, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, pb@linuxtv.org
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/usb/dvb-usb/dib0700_core.c

@@ -610,8 +610,6 @@ int dib0700_streaming_ctrl(struct dvb_usb_adapter *adap, int onoff)
 
 	st->buf[3] = 0x00;
 
-	st->channel_state &= ~0x3;
-
 	if ((adap->fe_adap[0].stream.props.endpoint != 2)
 	    && (adap->fe_adap[0].stream.props.endpoint != 3)) {
 		deb_info("the endpoint number (%i) is not correct, use the adapter id instead\n",
@@ -624,7 +622,7 @@ int dib0700_streaming_ctrl(struct dvb_usb_adapter *adap, int onoff)
 	if (onoff)
 		st->channel_state |= 1 << adapt_nr;
 	else
-		st->channel_state |= 1 << (1 - adapt_nr);
+		st->channel_state &= ~(1 << adapt_nr);
 
 	st->buf[2] |= st->channel_state;