This ports the following barebox commit:

| commit 8a6a9fb
| Author: Andrey Smirnov <andrew.smirnov@gmail.com>
| Date:   Wed Mar 6 23:49:23 2019 -0800
|
|     state: Fix lseek error check in state_mtd_peb_read()
|
|     Don't use 'int' to store lseek()'s return value to avoid problems with
|     large seek offsets. While at it, make sure to populate return error
|     code from 'errno'.
|
|     Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
|     Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Signed-off-by: Ulrich Ölmann <u.oelmann@pengutronix.de>