[PATCH -next] spi: at91-usart: Use PTR_ERR_OR_ZERO() to simplify code

[Mark Brown]

On Tue, Aug 22, 2023 at 03:11:01PM +0200, Nicolas Ferre wrote:

> Do we really need these changes?... oh well, no strong opinion but is it
> worth the effort?

I tend to go on the basis that for this sort of thing that's recognised
by pattern matching other people will end up sending versions of it no
matter what.
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