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Check for NULL return value with dma_alloc_coherent, in line with
Robin's fix for vic.c in 'drm/tegra: vic: Fix DMA API misuse'.
Fixes: 46f226c93d ("drm/tegra: Add NVDEC driver")
Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20250702-nvdec-dma-error-check-v1-1-c388b402c53a@nvidia.com