[PATCH v2] dnsproxy: Fix cached ttl update

This bug was exposed after fixing the signedness comparison warnings
found in dnsproxy.c update_cached_ttl() consistently comes up two
bytes short when processing the last record.
---
 src/dnsproxy.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/src/dnsproxy.c b/src/dnsproxy.c
index d4242560..23015f74 100644
--- a/src/dnsproxy.c
+++ b/src/dnsproxy.c
@@ -507,10 +507,8 @@ static void send_cached_response(int sk, const unsigned char *ptr, size_t len,
 	/* if this is a negative reply, we are authoritative */
 	if (answers == 0)
 		hdr->aa = 1;
-	else {
-		const int adj_len = len - 2;
-		update_cached_ttl((unsigned char *)hdr, adj_len, ttl);
-	}
+	else
+		update_cached_ttl((unsigned char *)hdr, dns_len, ttl);
 
 	debug("sk %d id 0x%04x answers %d ptr %p length %zd dns %zd",
 		sk, hdr->id, answers, ptr, len, dns_len);
-- 
2.34.1