Decrementing the AR count when stripping EDNS0 Option record

Change-Id: I6f5feac8edc7f4fe8e3fab7db13fad08408bafbc
diff --git a/src/edns0.c b/src/edns0.c
index 4b2dedf..2f9d9d6 100644
--- a/src/edns0.c
+++ b/src/edns0.c
@@ -536,6 +536,7 @@
         {
           insert_appid_catid_to_ipset(ansp, opdlen);
           memmove(ansp, ansp + oplen, plen - oplen);
+          header->arcount = htons(arcount-1);
         }
         else
         {