- 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.

libbb/bb_xsocket.c

@@ -0,0 +1,18 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * bb_xsocket.c - a socket() which dies on failure with error message
+ *
+ * Copyright (C) 2006 Denis Vlasenko
+ *
+ * Licensed under LGPL, see file docs/lesser.txt in this tarball for details.
+ */
+#include <sys/socket.h>
+#include "libbb.h"
+
+int bb_xsocket(int domain, int type, int protocol)
+{
+	int r = socket(domain, type, protocol);
+	if (r < 0)
+		bb_perror_msg_and_die("socket");
+	return r;
+}