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rtc: pcf2127: fix pcf2127_nvmem_read/write() returns
[ Upstream commit ba1c30b ] These functions should return zero on success. Non-zero returns are treated as error. On some paths, this doesn't matter but in nvmem_cell_read() a non-zero return would be passed to ERR_PTR() and lead to an Oops. Fixes: d6c3029 ("rtc: pcf2127: add support for accessing internal static RAM") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Link: https://lore.kernel.org/r/20201022070451.GA2817669@mwanda Signed-off-by: Sasha Levin <sashal@kernel.org>
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