dsa: fix promiscuity leak on slave dev open error

DSA master netdev promiscuity counter was not being properly
decremented on slave device open error path.

Signed-off-by: Gilad Ben-Yossef <[e-mail]>
CC: Gilad Ben-Yossef <[e-mail]>
CC: David S. Miller <[e-mail]>
CC: Florian Fainelli <[e-mail]>
CC: Guenter Roeck <[e-mail]>
CC: Andrew Lunn <[e-mail]>
CC: Scott Feldman <[e-mail]>
Acked-by: Andrew Lunn <[e-mail]>
Acked-by: Florian Fainelli <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/dsa/slave.c

···
 
 clear_promisc:
 	if (dev->flags & IFF_PROMISC)
-		dev_set_promiscuity(master, 0);
+		dev_set_promiscuity(master, -1);
 clear_allmulti:
 	if (dev->flags & IFF_ALLMULTI)
 		dev_set_allmulti(master, -1);