If socket is already connected, just return true

Socket connection may have been finished elsewhere, such as by
IO.select. If already connected, just return true.

Author: headius

core/src/main/java/org/jruby/ext/socket/RubySocket.java

@@ -522,7 +522,9 @@ private boolean tryConnect(ThreadContext context, Channel channel, SocketAddress
                         if (channel instanceof SocketChannel) {
                             SocketChannel socket = (SocketChannel) channel;
 
-                            if (socket.isConnectionPending()) {
+                            if (socket.isConnected()) {
+                                return true;
+                            } else if (socket.isConnectionPending()) {
                                 // connection initiated but not finished
                                 result = socket.finishConnect();
                             } else {