net: bridge: fix br_vlan_get_{pvid,info} return values

These two functions return the regular -EINVAL failure in the normal
code path, but return a nonstandard '-1' error otherwise, which gets
interpreted as -EPERM.

Let's change it to -EINVAL for the dummy functions as well.

Fixes: 4d4fd36126 ("net: bridge: Publish bridge accessor functions")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/if_bridge.h

@@ -105,13 +105,13 @@ static inline bool br_vlan_enabled(const struct net_device *dev)
 
 static inline int br_vlan_get_pvid(const struct net_device *dev, u16 *p_pvid)
 {
-	return -1;
+	return -EINVAL;
 }
 
 static inline int br_vlan_get_info(const struct net_device *dev, u16 vid,
 				   struct bridge_vlan_info *p_vinfo)
 {
-	return -1;
+	return -EINVAL;
 }
 #endif