[dnssd] fix minimal mDNS resolver issues

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

src/lib/dnssd/Resolver_ImplMinimalMdns.cpp

@@ -176,9 +176,9 @@ 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.mAddress[mDiscoveredNodeData.numIPs++] = addr;
-    mNodeData.mInterfaceId                           = mInterfaceId;
-    mHasIP                                           = true;
+    mNodeData.mAddress[mNodeData.mNumIPs++] = addr;
+    mNodeData.mInterfaceId                  = mInterfaceId;
+    mHasIP                                  = true;
 }
 
 void PacketDataReporter::OnDiscoveredNodeIPAddress(const chip::Inet::IPAddress & addr)
@@ -402,13 +402,13 @@ 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);
 }