[PATCH] mconf.c: Honor $LINES and $COLUMNS if TIOCGWINSZ failed

While reading code, I found this buglet.  If the TIOCGWINSZ fails,
mconf.c assumes 24/80 as screen size, without honoring the LINES and
COLUMNS environment variables.  This is the shorter and IMHO more
correct version.
Signed-off-by: Jan-Benedict Glaw <jbglaw@lug-owl.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

scripts/kconfig/mconf.c

@@ -87,7 +87,7 @@ static char filename[PATH_MAX+1] = ".config";
 static char *args[1024], **argptr = args;
 static int indent;
 static struct termios ios_org;
-static int rows, cols;
+static int rows = 0, cols = 0;
 static struct menu *current_menu;
 static int child_count;
 static int do_resize;
@@ -113,12 +113,11 @@ static void init_wsize(void)
 	struct winsize ws;
 	char *env;
 
-	if (ioctl(1, TIOCGWINSZ, &ws) == -1) {
-		rows = 24;
-		cols = 80;
-	} else {
+	if (!ioctl(STDIN_FILENO, TIOCGWINSZ, &ws)) {
 		rows = ws.ws_row;
 		cols = ws.ws_col;
+	}
+
 	if (!rows) {
 		env = getenv("LINES");
 		if (env)
@@ -133,7 +132,6 @@ static void init_wsize(void)
 		if (!cols)
 			cols = 80;
 	}
-	}
 
 	if (rows < 19 || cols < 80) {
 		fprintf(stderr, "Your display is too small to run Menuconfig!\n");