net: fix error details in connect()

3ac4941953 introduced a
bug as it attempted to access properties of an
undefined variable. This commit cleans up the offending
code.

Fixes: https://github.com/iojs/io.js/issues/510
PR-URL: https://github.com/iojs/io.js/pull/514
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

lib/net.js

@@ -813,13 +813,13 @@ function connect(self, address, port, addressType, localAddress, localPort) {
   }
 
   if (err) {
-    self._getsockname();
+    var sockname = self._getsockname();
     var details;
-    if (self._sockname) {
-      ex.localAddress = self._sockname.address;
-      ex.localPort = self._sockname.port;
-      details = ex.localAddress + ':' + ex.localPort;
+
+    if (sockname) {
+      details = sockname.address + ':' + sockname.port;
     }
+
     var ex = exceptionWithHostPort(err, 'connect', address, port, details);
     self._destroy(ex);
   }