netfilter: xtables: change hotdrop pointer to direct modification

Since xt_action_param is writable, let's use it. The pointer to
'bool hotdrop' always worried (8 bytes (64-bit) to write 1 byte!).
Surprisingly results in a reduction in size:

   text    data     bss filename
5457066  692730  357892 vmlinux.o-prev
5456554  692730  357892 vmlinux.o

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
diff --git a/net/netfilter/xt_connlimit.c b/net/netfilter/xt_connlimit.c
index f130fd9..5c5b6b9 100644
--- a/net/netfilter/xt_connlimit.c
+++ b/net/netfilter/xt_connlimit.c
@@ -206,14 +206,14 @@
 
 	if (connections < 0) {
 		/* kmalloc failed, drop it entirely */
-		*par->hotdrop = true;
+		par->hotdrop = true;
 		return false;
 	}
 
 	return (connections > info->limit) ^ info->inverse;
 
  hotdrop:
-	*par->hotdrop = true;
+	par->hotdrop = true;
 	return false;
 }