[NETFILTER]: x_tables: remove some unnecessary casts

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/netfilter/xt_string.c b/net/netfilter/xt_string.c
index 79d9ea6..0ebb6ac 100644
--- a/net/netfilter/xt_string.c
+++ b/net/netfilter/xt_string.c
@@ -30,8 +30,8 @@
 		 unsigned int protoff,
 		 int *hotdrop)
 {
+	const struct xt_string_info *conf = matchinfo;
 	struct ts_state state;
-	struct xt_string_info *conf = (struct xt_string_info *) matchinfo;
 
 	memset(&state, 0, sizeof(struct ts_state));