net: bridge: vlan: fix global vlan option range dumping

When global vlan options are equal sequentially we compress them in a
range to save space and reduce processing time. In order to have the
proper range end id we need to update range_end if the options are equal
otherwise we get ranges with the same end vlan id as the start.

Fixes: 743a53d ("net: bridge: vlan: add support for dumping global vlan options")
Signed-off-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Link: https://lore.kernel.org/r/20210810092139.11700-1-razor@blackwall.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: Nikolay Aleksandrov

net/bridge/br_vlan.c

@@ -2019,7 +2019,7 @@ static int br_vlan_dump_dev(const struct net_device *dev,
 
 		if (dump_global) {
 			if (br_vlan_global_opts_can_enter_range(v, range_end))
-				continue;
+				goto update_end;
 			if (!br_vlan_global_opts_fill(skb, range_start->vid,
 						      range_end->vid,
 						      range_start)) {
@@ -2045,6 +2045,7 @@ static int br_vlan_dump_dev(const struct net_device *dev,
 
 			range_start = v;
 		}
+update_end:
 		range_end = v;
 	}