net: delete duplicate dev_set_rx_mode() call

In __dev_open(), it already calls dev_set_rx_mode().
and dev_set_rx_mode() has no effect for a net device which does not have
IFF_UP flag set.

So the call of dev_set_rx_mode() is duplicate in __dev_change_flags().
Signed-off-by: NWeiping Pan <panweiping3@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/core/dev.c

@@ -5432,13 +5432,9 @@ int __dev_change_flags(struct net_device *dev, unsigned int flags)
 	 */
 
 	ret = 0;
-	if ((old_flags ^ flags) & IFF_UP) {	/* Bit is different  ? */
+	if ((old_flags ^ flags) & IFF_UP)
 		ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
 
-		if (!ret)
-			dev_set_rx_mode(dev);
-	}
-
 	if ((flags ^ dev->gflags) & IFF_PROMISC) {
 		int inc = (flags & IFF_PROMISC) ? 1 : -1;
 		unsigned int old_flags = dev->flags;