[PATCH] i2c: rk3x: fix 0 length write transfers

[Wolfram Sang]

> Reviewed-By: Max Schwarz <max.schwarz at online.de>
> Tested-By: Max Schwarz <max.schwarz at online.de>

Checkpatch says: 

WARNING: 'Tested-by:' is the preferred signature form

Same 'Reviewed-by:'
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