bridge: Fix compilation warning in function br_stp_recalculate_bridge_id()

net/bridge/br_stp_if.c: In function ‘br_stp_recalculate_bridge_id’:
net/bridge/br_stp_if.c:216:3: warning: ‘return’ with no value, in function returning non-void

Signed-off-by: G.Balaji <balajig81@gmail.com>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/bridge/br_stp_if.c

@@ -213,7 +213,7 @@ bool br_stp_recalculate_bridge_id(struct net_bridge *br)
 
 	/* user has chosen a value so keep it */
 	if (br->flags & BR_SET_MAC_ADDR)
-		return;
+		return false;
 
 	list_for_each_entry(p, &br->port_list, list) {
 		if (addr == br_mac_zero ||