Check rfbGetScreen() return value everywhere.

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

1 files changed, 3 insertions, 2 deletions

diff --git a/examples/example.c b/examples/example.c
index 31bc38d..93fdf28 100644
--- a/examples/example.c
+++ b/examples/example.c
@@ -279,8 +279,9 @@ static void MakeRichCursor(rfbScreenInfoPtr rfbScreen)
 
 int main(int argc,char** argv)
 {
-  rfbScreenInfoPtr rfbScreen =
-    rfbGetScreen(&argc,argv,maxx,maxy,8,3,bpp);
+  rfbScreenInfoPtr rfbScreen = rfbGetScreen(&argc,argv,maxx,maxy,8,3,bpp);
+  if(!rfbScreen)
+    return 0;
   rfbScreen->desktopName = "LibVNCServer Example";
   rfbScreen->frameBuffer = (char*)malloc(maxx*maxy*bpp);
   rfbScreen->alwaysShared = TRUE;