tools/bootconfig: Fix the wrong format specifier

Use '%u' instead of '%d' for unsigned int.

Link: https://lore.kernel.org/all/[e-mail]/

Fixes: 973780011106 ("tools/bootconfig: Suppress non-error messages")
Signed-off-by: Luo Yifan <[e-mail]>
Signed-off-by: Masami Hiramatsu (Google) <[e-mail]>

tools/bootconfig/main.c

···
 	/* Wrong Checksum */
 	rcsum = xbc_calc_checksum(*buf, size);
 	if (csum != rcsum) {
-		pr_err("checksum error: %d != %d\n", csum, rcsum);
+		pr_err("checksum error: %u != %u\n", csum, rcsum);
 		return -EINVAL;
 	}
 
···
 	xbc_get_info(&ret, NULL);
 	printf("\tNumber of nodes: %d\n", ret);
 	printf("\tSize: %u bytes\n", (unsigned int)size);
-	printf("\tChecksum: %d\n", (unsigned int)csum);
+	printf("\tChecksum: %u\n", (unsigned int)csum);
 
 	/* TODO: Check the options by schema */
 	xbc_exit();