netfilter: xtables: add missing const qualifier to xt_tgchk_param

When entryinfo was a standalone parameter to functions, it used to be
"const void *". Put the const back in.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netfilter/x_tables.h b/include/linux/netfilter/x_tables.h
index be41b60..e52ce47 100644
--- a/include/linux/netfilter/x_tables.h
+++ b/include/linux/netfilter/x_tables.h
@@ -251,7 +251,7 @@
  */
 struct xt_tgchk_param {
 	const char *table;
-	void *entryinfo;
+	const void *entryinfo;
 	const struct xt_target *target;
 	void *targinfo;
 	unsigned int hook_mask;