media: lmedm04: don't ignore errors when setting a filter

Solves a clang warning.
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/usb/dvb-usb-v2/lmedm04.c

@@ -423,6 +423,9 @@ static int lme2510_pid_filter_ctrl(struct dvb_usb_adapter *adap, int onoff)
 
 	mutex_unlock(&d->i2c_mutex);
 
+	if (ret)
+		return -EREMOTEIO;
+
 	return 0;
 }