Re: [PATCH] iio: adc: gyroadc: fix uninitialized return code

[Wolfram Sang]

On Thu, Jul 04, 2019 at 01:37:47PM +0200, Arnd Bergmann wrote:
> gcc-9 complains about a blatant uninitialized variable use that
> all earlier compiler versions missed:
> 
> drivers/iio/adc/rcar-gyroadc.c:510:5: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized]
> 
> Return -EINVAL instead here.
> 
> Cc: stable@xxxxxxxxxxxxxxx
> Fixes: 059c53b32329 ("iio: adc: Add Renesas GyroADC driver")
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>

This is correct but missing that the above 'return ret' is broken, too.
ret is initialized but 0 in that case.

And maybe we can use something else than -EINVAL for this case? I am on
the go right now, I will look for a suggestion later.

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