sriov: fix crash in rtnl_link_sriov_parse_vflist

vf_vlan_info was incorrectly indexed with "len" (the length in bytes
of the entire vfinfo_list rather than list_len (the index of the
current end of the vf_vlan_info array)

thom311/libnl#126
http://lists.infradead.org/pipermail/libnl/2017-January/002270.html

Fixes: 5d6e43e

Signed-off-by: Thomas Haller <thaller@redhat.com>

lib/route/link/sriov.c

@@ -568,7 +568,7 @@ int rtnl_link_sriov_parse_vflist(struct rtnl_link *link, struct nlattr **tb) {
 			list_len = 0;
 			nla_for_each_nested(nla_list, t[IFLA_VF_VLAN_LIST],
 					    list_rem) {
-				vf_vlan_info[len] = nla_data(nla_list);
+				vf_vlan_info[list_len] = nla_data(nla_list);
 				list_len++;
 			}