bgpd: fix covery 1566055, label table overrun

In case the full label stack is used, there may be
a table overrun happening. Avoid it by increasing the
size of the table.

Fixes: 27f4dee ("bgpd: update the mpls entry to handle return traffic")
Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>

bgpd/bgp_mplsvpn.c

@@ -3990,7 +3990,7 @@ static void bgp_mplsvpn_nh_label_bind_send_nexthop_label(
 {
 	struct prefix pfx_nh, *p = NULL;
 	uint32_t num_labels = 0, lsp_num_labels;
-	mpls_label_t label[MPLS_MAX_LABELS];
+	mpls_label_t label[MPLS_MAX_LABELS + 1];
 	struct nexthop *nh;
 	ifindex_t ifindex = IFINDEX_INTERNAL;
 	vrf_id_t vrf_id = VRF_DEFAULT;