ipvs: Mark net_vs_ctl_path const

Signed-off-by: Sven Wegener <sven.wegener@stealer.net>
Acked-by: Simon Horman <horms@verge.net.au>
diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index e980416..c8ee9b8 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -620,7 +620,7 @@
 extern int sysctl_ip_vs_sync_threshold[2];
 extern int sysctl_ip_vs_nat_icmp_send;
 extern struct ip_vs_stats ip_vs_stats;
-extern struct ctl_path net_vs_ctl_path[];
+extern const struct ctl_path net_vs_ctl_path[];
 
 extern struct ip_vs_service *
 ip_vs_service_get(__u32 fwmark, __u16 protocol, __be32 vaddr, __be16 vport);