drm/nouveau: properly handle allocation failure in nouveau_sgdma_populate
Not cleaning after alloc failure would result in crash on destroy, because nouveau_sgdma_clear assumes "ttm_alloced" to be not null when "pages" is not null. Signed-off-by: NMarcin Slusarz <marcin.slusarz@gmail.com> Cc: stable@kernel.org Signed-off-by: NBen Skeggs <bskeggs@redhat.com>
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