Some basic code maintenance in games/

- in main() replace exit with return
- drop some /* NOTREACHED */ lint comments along the way.
- make more use of standard CFLAGS, esp. -Wimplicit-function-declaration
- add and sort some headers when needed
- add straightforward pledges to some programs used at compile time

discussed with and ok mestre@

1 files changed, 3 insertions, 3 deletions

diff --git a/games/atc/main.c b/games/atc/main.c
index 2d8526f9345..ea3a42da1f8 100644
--- a/games/atc/main.c
+++ b/games/atc/main.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: main.c,v 1.26 2015/12/31 16:50:29 mestre Exp $	*/
+/*	$OpenBSD: main.c,v 1.27 2016/01/07 16:00:31 tb Exp $	*/
 /*	$NetBSD: main.c,v 1.4 1995/04/27 21:22:25 mycroft Exp $	*/
 
 /*-
@@ -129,7 +129,7 @@ main(int argc, char *argv[])
 	}
 		
 	if (f_usage || f_showscore || f_list || f_printpath)
-		exit(0);
+		return 0;
 
 	if (file == NULL)
 		file = default_game();
@@ -137,7 +137,7 @@ main(int argc, char *argv[])
 		file = okay_game(file);
 
 	if (file == NULL || read_file(file) < 0)
-		exit(1);
+		return 1;
 
 	setup_screen(sp);