team: Remove NULL check before dev_{put, hold}

The call netdev_{put, hold} of dev_{put, hold} will check NULL,
so there is no need to check before using dev_{put, hold},
remove it to silence the warning:

./drivers/net/team/team.c:2325:3-10: WARNING: NULL check before dev_{put, hold} functions is not needed.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=5991
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/team/team.c

@@ -2321,8 +2321,7 @@ static struct team *team_nl_team_get(struct genl_info *info)
 	ifindex = nla_get_u32(info->attrs[TEAM_ATTR_TEAM_IFINDEX]);
 	dev = dev_get_by_index(net, ifindex);
 	if (!dev || dev->netdev_ops != &team_netdev_ops) {
-		if (dev)
-			dev_put(dev);
+		dev_put(dev);
 		return NULL;
 	}