[PATCH] spi: microchip-core: fix passing zero to PTR_ERR warning

[Mark Brown]

On Wed, Jun 15, 2022 at 12:42:27PM +0000, Conor.Dooley at microchip.com wrote:
> On 15/06/2022 13:37, Mark Brown wrote:

> >> But if spi->clk is NULL, this will return 0 from the probe
> >> rather than returning an error?
> >> If that's not what you meant, lmk

> > Oh, hang on - what error conditions can clk_get() return 0 in?  The
> > documentation doesn't mention any...

> If !CONFIG_HAVE_CLK, (without which it won't boot on the coreplex)
> but I don't think I can be sure that CONFIG_HAVE_CLK will /always/
> be enabled for other uses of the FPGA.

That's not an error, that's returning NULL as a dummy clock.  The
expectation is that the driver will proceed as though it has a clock.
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