net: dns: responder: No need to double the socket count

The socket allocation count was incorrectly calculated as
we have only one socket per listened port.

Signed-off-by: Jukka Rissanen <jukka.rissanen@nordicsemi.no>

subsys/net/lib/dns/mdns_responder.c

diff --git a/subsys/net/lib/dns/mdns_responder.c b/subsys/net/lib/dns/mdns_responder.c
index e92db7d..ab4e8e4 100644
--- a/subsys/net/lib/dns/mdns_responder.c
+++ b/subsys/net/lib/dns/mdns_responder.c
@@ -65,11 +65,7 @@
 #define DNS_RESOLVER_BUF_CTR	(DNS_RESOLVER_MIN_BUF + \
 				 CONFIG_MDNS_RESOLVER_ADDITIONAL_BUF_CTR)
 
-#if (IS_ENABLED(CONFIG_NET_IPV6) && IS_ENABLED(CONFIG_NET_IPV4))
-#define MDNS_MAX_POLL (2 * (MAX_IPV4_IFACE_COUNT + MAX_IPV6_IFACE_COUNT))
-#else
-#define MDNS_MAX_POLL (1 * (MAX_IPV4_IFACE_COUNT + MAX_IPV6_IFACE_COUNT))
-#endif
+#define MDNS_MAX_POLL (MAX_IPV4_IFACE_COUNT + MAX_IPV6_IFACE_COUNT)
 
 static void svc_handler(struct k_work *work);
 NET_SOCKET_SERVICE_SYNC_DEFINE_STATIC(svc_mdns, NULL, svc_handler, MDNS_MAX_POLL);