[adb] Check for null in mdns connect info.

Adb client does not use these values, so just ignore it.

Bug: b/158824677

Test: 'adb -H 127.0.0.1 -P 5037 devices' does not crash.
Change-Id: I4dada6e5e1714157bbf1af370510dfa7bfbd6b17

adb/client/transport_mdns.cpp

@@ -680,6 +680,13 @@ std::string mdns_list_discovered_services() {
 std::optional<MdnsInfo> mdns_get_connect_service_info(std::string_view name) {
     CHECK(!name.empty());
 
+    // only adb server creates these registries
+    if (!ResolvedService::sAdbTransportServices && !ResolvedService::sAdbSecureConnectServices) {
+        return std::nullopt;
+    }
+    CHECK(ResolvedService::sAdbTransportServices);
+    CHECK(ResolvedService::sAdbSecureConnectServices);
+
     auto mdns_instance = mdns::mdns_parse_instance_name(name);
     if (!mdns_instance.has_value()) {
         D("Failed to parse mDNS name [%s]", name.data());