[dnssd] fix minimal mDNS resolver issues

* Fix initialization with advertiser
* Fix wrong IP number in resolution result

src/lib/dnssd/Resolver_ImplMinimalMdns.cpp

@@ -176,6 +176,7 @@ void PacketDataReporter::OnOperationalIPAddress(const chip::Inet::IPAddress & ad
     // This code assumes that all entries in the mDNS packet relate to the
     // same entity. This may not be correct if multiple servers are reported
     // (if multi-admin decides to use unique ports for every ecosystem).
+    mNodeData.mNumIPs++;
     mNodeData.mAddress[mDiscoveredNodeData.numIPs++] = addr;
     mNodeData.mInterfaceId                           = mInterfaceId;
     mHasIP                                           = true;
@@ -402,13 +403,13 @@ CHIP_ERROR MinMdnsResolver::Init(chip::Inet::InetLayer * inetLayer)
 {
     /// Note: we do not double-check the port as we assume the APP will always use
     /// the same inetLayer and port for mDNS.
+    mSystemLayer = inetLayer->SystemLayer();
+
     if (GlobalMinimalMdnsServer::Server().IsListening())
     {
         return CHIP_NO_ERROR;
     }
 
-    mSystemLayer = inetLayer->SystemLayer();
-
     return GlobalMinimalMdnsServer::Instance().StartServer(inetLayer, kMdnsPort);
 }