adb: add better logging for connection failure.

Test: manual
Change-Id: I1babee0e01376955529dc1e7d5e3257a7f51f33d
diff --git a/transport_local.cpp b/transport_local.cpp
index 1431252..8b8fd51 100644
--- a/transport_local.cpp
+++ b/transport_local.cpp
@@ -74,6 +74,7 @@
     std::string host;
     int port = DEFAULT_ADB_LOCAL_TRANSPORT_PORT;
     if (!android::base::ParseNetAddress(address, &host, &port, &serial, response)) {
+        D("failed to parse address: '%s'", address.c_str());
         return std::make_tuple(unique_fd(), port, serial);
     }
 
@@ -103,6 +104,7 @@
         return;
     }
 
+    D("connection requested to '%s'", address.c_str());
     unique_fd fd;
     int port;
     std::string serial;