net: bridge: fix br_stp_enable_bridge comment

br_stp_enable_bridge() does take the br->lock spinlock. Fix its wrongly
pasted comment and use the same as br_stp_disable_bridge().
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/bridge/br_stp_if.c

@@ -55,7 +55,7 @@ void br_init_port(struct net_bridge_port *p)
 		netdev_err(p->dev, "failed to set HW ageing time\n");
 }
 
-/* called under bridge lock */
+/* NO locks held */
 void br_stp_enable_bridge(struct net_bridge *br)
 {
 	struct net_bridge_port *p;