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

]

(From OE-Core rev: 41356d2c86d85b199962c3024f25361a709d9180)

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

(From Yocto rev: ffb7fd233ce23af06b54bee5b934f7d01271da97)

Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
Change-Id: Ic6e244369f5e86d3ee2411bf1f7566a6637622e3