netlink: constify nlmsghdr arguments

Consitfy nlmsghdr arguments to a couple of functions as preparation
for the next patch, which will constify the netlink message data in
all nfnetlink users.

Signed-off-by: Patrick McHardy <kaber@trash.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index da3163d15ef0..d0ff382c40ca 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1705,7 +1705,7 @@ errout:
 }
 
 int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
-                       struct nlmsghdr *nlh,
+                       const struct nlmsghdr *nlh,
                        int (*dump)(struct sk_buff *skb,
                                    struct netlink_callback *),
                        int (*done)(struct netlink_callback *))