tools/bootconfig: Print all error message in stderr

Print all error message in stderr. This also removes
unneeded tools/bootconfig/include/linux/printk.h.

Link: https://lkml.kernel.org/r/163187298106.2366983.15210300267326257397.stgit@devnote2Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

tools/bootconfig/include/linux/kernel.h

@@ -5,8 +5,6 @@
 #include <stdlib.h>
 #include <stdbool.h>
 
-#include <linux/printk.h>
-
 typedef unsigned short u16;
 typedef unsigned int   u32;
 

tools/bootconfig/include/linux/printk.h

-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _SKC_LINUX_PRINTK_H
-#define _SKC_LINUX_PRINTK_H
-
-#include <stdio.h>
-
-#define printk(fmt, ...) printf(fmt, ##__VA_ARGS__)
-
-#define pr_err printk
-#define pr_warn	printk
-#define pr_info	printk
-#define pr_debug printk
-
-#endif

tools/bootconfig/main.c

@@ -15,6 +15,8 @@
 #include <linux/kernel.h>
 #include <linux/bootconfig.h>
 
+#define pr_err(fmt, ...) fprintf(stderr, fmt, ##__VA_ARGS__)
+
 static int xbc_show_value(struct xbc_node *node, bool semicolon)
 {
 	const char *val, *eol;