media: dvb_frontend: fix return error code

The correct error code when a function is not defined is
-ENOTSUPP. It was typoed wrong as -EOPNOTSUPP, with,
unfortunately, exists, but it is not used by the DVB core.

Thanks-to: Geert Uytterhoeven <geert@linux-m68k.org>
Thanks-to: Arnd Bergmann <arnd@arndb.de>

To make me revisit this code.

Fixes: a9cb97c3 ("media: dvb_frontend: be sure to init dvb_frontend_handle_ioctl() return code")
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/dvb-core/dvb_frontend.c

@@ -2110,7 +2110,7 @@ static int dvb_frontend_handle_ioctl(struct file *file,
 	struct dvb_frontend *fe = dvbdev->priv;
 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
-	int i, err = -EOPNOTSUPP;
+	int i, err = -ENOTSUPP;
 
 	dev_dbg(fe->dvb->device, "%s:\n", __func__);