- patch from Denis Vlasenko to add and use bb_xsocket() and to use

bb_xopen some more while at it.
  Also use shorter boilerplate while at it.

docs/new-applet-HOWTO.txt

@@ -28,21 +28,7 @@ For a new applet mu, here is the code that would go in mu.c:
  *
  * Copyright (C) [YEAR] by [YOUR NAME] <YOUR EMAIL>
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- * 02111-1307 USA
- *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  */
 
 #include "busybox.h"
@@ -52,8 +38,7 @@ int mu_main(int argc, char **argv)
 	int fd;
 	char mu;
 
-	if ((fd = open("/dev/random", O_RDONLY)) < 0)
-		bb_perror_msg_and_die("/dev/random");
+	fd = bb_xopen("/dev/random", O_RDONLY);
 
 	if ((n = safe_read(fd, &mu, 1)) < 1)
 		bb_perror_msg_and_die("/dev/random");