[PATCH 5/5] spi: make remove callback a void function

[Mark Brown]

On Sun, Jan 23, 2022 at 06:52:01PM +0100, Uwe Kleine-König wrote:
> The value returned by an spi driver's remove function is mostly ignored.
> (Only an error message is printed if the value is non-zero that the
> error is ignored.)
> 
> So change the prototype of the remove function to return no value. This
> way driver authors are not tempted to assume that passing an error to
> the upper layer is a good idea. All drivers are adapted accordingly.
> There is no intended change of behaviour, all callbacks were prepared to
> return 0 before.

I was going to apply this but it needs rebasing against current code
unfortunately.
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