mtd-utils: Revert "Return correct error number in ubi_get_vol_in"

mtd-utils: Revert "Return correct error number in ubi_get_vol_in"

Add mtd-utils upstream patch that fixes a regression on the
mtd-utils tools such as ubinfo.

Details of the issue which affects mtd-utils 2.0.1 and 2.0.2:
http://lists.infradead.org/pipermail/linux-mtd/2018-June/081562.html

Upstream-Status: Accepted [http://git.infradead.org/mtd-utils.git/commit/0f833ac73ad631248826386e2918d8571ecf0347]

Signed-off-by: Adriana Kobylak <anoo@linux.ibm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>