bonding: add missed __rcu annotation for curr_active_slave

There is one direct accesses to bond->curr_active_slave in
bond_miimon_commit(). Protected it by rcu_access_pointer()
since the later of this function also use this one.
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/bonding/bond_main.c

@@ -2699,7 +2699,7 @@ static void bond_miimon_commit(struct bonding *bond)
 
 			bond_miimon_link_change(bond, slave, BOND_LINK_UP);
 
-			if (!bond->curr_active_slave || slave == primary)
+			if (!rcu_access_pointer(bond->curr_active_slave) || slave == primary)
 				goto do_failover;
 
 			continue;