[RESEND PATCH v1] i2c: i2c-stm32f7: fix no check on returned setup

[Wolfram Sang]

On Mon, Mar 12, 2018 at 01:53:21PM +0100, Pierre-Yves MORDRET wrote:
> Before assigning returned setup structure check if not null
> 
> Fixes: 463a9215f3ca7600b5ff ("i2c: stm32f7: fix setup structure")
> Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret at st.com>

Maxime? Alexandre?

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