[media] mxl111sf: fix error on stream stop in mxl111sf_ep6_streaming_ctrl()

Remove unnecessary register access in mxl111sf_ep6_streaming_ctrl()

This code breaks driver operation in kernel 3.3 and later, although
it works properly in 3.2  Disable register access to 0x12 for now.
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Cc: stable@kernel.org
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/dvb-usb/mxl111sf.c

@@ -351,15 +351,13 @@ static int mxl111sf_ep6_streaming_ctrl(struct dvb_usb_adapter *adap, int onoff)
 					      adap_state->ep6_clockphase,
 					      0, 0);
 		mxl_fail(ret);
+#if 0
 	} else {
 		ret = mxl111sf_disable_656_port(state);
 		mxl_fail(ret);
+#endif
 	}
 
-	mxl111sf_read_reg(state, 0x12, &tmp);
-	tmp &= ~0x04;
-	mxl111sf_write_reg(state, 0x12, tmp);
-
 	return ret;
 }