Cygwin: utils: convert usage() to proper noreturn function throughout

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

winsup/utils/setmetamode.c

@@ -10,16 +10,17 @@ details. */
 
 #include <errno.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <getopt.h>
 #include <sys/ioctl.h>
 #include <cygwin/kd.h>
 #include <cygwin/version.h>
 
-static void
-usage (void)
+static void __attribute__ ((__noreturn__))
+usage (FILE *stream)
 {
-  fprintf (stderr, "Usage: %s [metabit|escprefix]\n"
+  fprintf (stream, "Usage: %s [metabit|escprefix]\n"
 	   "\n"
 	   "Get or set keyboard meta mode\n"
 	   "\n"
@@ -32,6 +33,7 @@ usage (void)
 	   "  -h, --help           This text\n"
 	   "  -V, --version        Print program version and exit\n\n",
 	   program_invocation_short_name);
+  exit (stream == stdout ? 0 : 1);
 }
 
 static void
@@ -87,8 +89,7 @@ main (int ac, char *av[])
     switch (opt)
       {
       case 'h':
-	usage ();
-	return 0;
+	usage (stdout);
       case 'V':
 	print_version ();
 	return 0;
@@ -105,10 +106,7 @@ main (int ac, char *av[])
 	   || !strcmp ("escprefix", av[1]))
     param = 0x04;
   else
-    {
-      usage ();
-      return 1;
-    }
+    usage (stderr);
   if (ioctl (0, KDSKBMETA, param) < 0)
     {
       error ();