solve a kernel mem leak when strict-source is set and triggered

Change-Id: Ib603c5b9587e9b027d34e20bc135a755ab04caf3
(cherry picked from commit 0a593cfed1)

kernel-module/xt_RTPENGINE.c

@@ -2456,6 +2456,7 @@ static unsigned int rtpengine46(struct sk_buff *skb, struct rtpengine_table *t,
 	struct rtpengine_target *g;
 	struct sk_buff *skb2;
 	int err;
+	int error_nf_action = XT_CONTINUE;
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,0,0)
 	int rtp_pt_idx = -2;
 #endif
@@ -2516,8 +2517,8 @@ not_stun:
 	if (g->target.src_mismatch == MSM_PROPAGATE)
 		goto skip1;
 	/* MSM_DROP */
-	err = -1;
-	goto out;
+	error_nf_action = NF_DROP;
+	goto skip_error;
 
 src_check_ok:
 	if (g->target.dtls && is_dtls(skb))
@@ -2579,8 +2580,6 @@ not_rtp:
 
 	err = send_proxy_packet(skb, &g->target.src_addr, &g->target.dst_addr, g->target.tos, par);
 
-out:
-
 	if (atomic64_read(&g->stats.packets)==0)
 		atomic_set(&g->stats.in_tos,in_tos);
 
@@ -2639,7 +2638,7 @@ skip1:
 skip2:
 	kfree_skb(skb);
 	table_push(t);
-	return XT_CONTINUE;
+	return error_nf_action;
 }