CVE-2025-38543 drm/tegra: nvdec: Fix dma_alloc_coherent error check

In the Linux kernel, the following vulnerability has been resolved: drm/tegra: nvdec: Fix dmaalloccoherent error check Check for NULL return value with dmaalloccoherent, in line with Robin's fix for vic.c in 'drm/tegra: vic: Fix DMA API misuse'...