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mtd: mtdraw: do not write empty buffers
When a page is completely 0xff then do not write it since users
expect pages to be writable when they are empty.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
WIP_next-LS master next stable/v2018.12 v2020.07.0 v2020.06.0 v2020.05.0 v2020.04.0 v2020.03.0 v2020.02.0 v2020.01.0 v2019.12.0 v2019.11.0 v2019.10.0 v2019.09.0 v2019.08.1 v2019.08.0 v2019.07.0 v2019.06.1 v2019.06.0 v2019.05.0 v2019.04.0 v2019.03.0 v2019.02.0 v2019.01.0 v2018.12.0 v2018.11.0
1 parent 06095d2 commit 8bc9f5d6085a3941c5a6c767efb96713d4e5c066
@Sascha Hauer Sascha Hauer authored on 21 Sep 2018
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drivers/mtd/mtdraw.c