i2c: rcar: bail out on zero length transfers
This hardware does not support zero length transfers. Instead, the driver does one (random) byte transfers currently with undefined results for the slaves. We now bail out. Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: NWolfram Sang <wsa@the-dreams.de> Cc: stable@kernel.org
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