Cleaned up exit from main to prevent MSVC warnings
diff --git a/progs/samples/overlay.c b/progs/samples/overlay.c
index 41bbc26..0def2b1 100644
--- a/progs/samples/overlay.c
+++ b/progs/samples/overlay.c
@@ -351,7 +351,7 @@
     }
 
     if (Args(argc, argv) == GL_FALSE) {
-	exit(1);
+	return(1);
     }
 
     windW = 300;
@@ -363,7 +363,7 @@
     glutInitDisplayMode(type);
 
     if (glutCreateWindow("Overlay Test") == GL_FALSE) {
-	exit(1);
+	return(1);
     }
 
     glutEstablishOverlay();