drm/drm_pci.c: Use dma_zalloc_coherent
Replace dma_alloc_coherent + memset with dma_zalloc_coherent. Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20181023040222.GA1540@jordon-HP-15-Notebook-PC
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