Check rfbGetScreen() return value everywhere.

This fixes a segfault when a server is invoked with the
'-help' commandline argument.

1 files changed, 2 insertions, 0 deletions

diff --git a/examples/simple.c b/examples/simple.c
index f6e94dc..6167d72 100644
--- a/examples/simple.c
+++ b/examples/simple.c
@@ -3,6 +3,8 @@
 int main(int argc,char** argv)
 {                                                                
   rfbScreenInfoPtr server=rfbGetScreen(&argc,argv,400,300,8,3,4);
+  if(!server)
+    return 0;
   server->frameBuffer=(char*)malloc(400*300*4);
   rfbInitServer(server);           
   rfbRunEventLoop(server,-1,FALSE);