SDLvncviewer: make listen mode work _somewhat_.

set the port to listen on and really ensure that the
window of the fork()ed instance is closed.

works somewhat: it's now actually possible to listen for an
incoming connection and to close it again, but the second
connection attempt fails with 'XIO:  fatal IO error 11
(Resource temporarily unavailable)'. this could relate to the
fact that SDL uses threads internally and we're fork()ing
here...
Signed-off-by: Christian Beier <dontmind@freeshell.org>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

client_examples/SDLvncviewer.c

@@ -471,6 +471,7 @@ int main(int argc,char** argv) {
 	SDL_EnableUNICODE(1);
 	SDL_EnableKeyRepeat(SDL_DEFAULT_REPEAT_DELAY,
 			SDL_DEFAULT_REPEAT_INTERVAL);
+	atexit(SDL_Quit);
 
 	/* 16-bit: cl=rfbGetClient(5,3,2); */
 	cl=rfbGetClient(8,3,4);
@@ -480,6 +481,7 @@ int main(int argc,char** argv) {
 	cl->HandleKeyboardLedState=kbd_leds;
 	cl->HandleTextChat=text_chat;
 	cl->GotXCutText = got_selection;
+	cl->listenPort = LISTEN_PORT_OFFSET;
 	if(!rfbInitClient(cl,&argc,argv))
 		return 1;