[PATCH 3/4] spi: stm32: properly fail on dma_request_chan error

[Mark Brown]

On Wed, Dec 17, 2025 at 10:51:33PM +0100, Alain Volmat wrote:
> Correct handling of the dma_request_chan call in order to avoid
> misleading warn message if no DMA is provided within the device-tree
> and moreover fail if dma_request_chan has returned a valid error.

Bug fixes should go at the start of serieses to avoid spurious
dependencies on new or cleanup changes.
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