dmaengine: zxdma: Fix off-by-one for testing valid pchan request
The valid pchan range is 0 ~ d->dma_requests - 1. Signed-off-by: Axel Lin <axel.lin@ingics.com> Reviewed-by: Jun Nie <jun.nie@linaro.org> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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