net: dsa: microchip: Fix Wake-on-LAN check to not return an error

The wol variable in ksz_port_set_mac_address() is declared with random
data, but the code in ksz_get_wol call may not be executed so the
WAKE_MAGIC check may be invalid resulting in an error message when
setting a MAC address after starting the DSA driver.

Fixes: 3b454b6390 ("net: dsa: microchip: ksz9477: Add Wake on Magic Packet support")
Signed-off-by: Tristram Ha <tristram.ha@microchip.com>
Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://patch.msgid.link/20240805235200.24982-1-Tristram.Ha@microchip.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/dsa/microchip/ksz_common.c

@@ -3764,6 +3764,11 @@ static int ksz_port_set_mac_address(struct dsa_switch *ds, int port,
 		return -EBUSY;
 	}
 
+	/* Need to initialize variable as the code to fill in settings may
+	 * not be executed.
+	 */
+	wol.wolopts = 0;
+
 	ksz_get_wol(ds, dp->index, &wol);
 	if (wol.wolopts & WAKE_MAGIC) {
 		dev_err(ds->dev,