[Intel-gfx] [drm-intel:for-linux-next 479/497] drivers/gpu/drm/i915/i915_gem_gtt.c:1086:26: sparse: Using plain integer as NULL pointer

[kbuild test robot]

tree:   git://anongit.freedesktop.org/drm-intel for-linux-next
head:   176b15ab89a89f5bd5f73f96afcc5c4a6105fa5e
commit: fb6c09f3ae620c5e0db5b4c2058a9c25b52197f9 [479/497] drm/i915/gen8: Make pdp allocation more dynamic
reproduce:
  # apt-get install sparse
  git checkout fb6c09f3ae620c5e0db5b4c2058a9c25b52197f9
  make ARCH=x86_64 allmodconfig
  make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> drivers/gpu/drm/i915/i915_gem_gtt.c:1086:26: sparse: Using plain integer as NULL pointer

vim +1086 drivers/gpu/drm/i915/i915_gem_gtt.c

  1070		if (IS_ENABLED(CONFIG_X86_32))
  1071			/* While we have a proliferation of size_t variables
  1072			 * we cannot represent the full ppgtt size on 32bit,
  1073			 * so limit it to the same size as the GGTT (currently
  1074			 * 2GiB).
  1075			 */
  1076			ppgtt->base.total = to_i915(ppgtt->base.dev)->gtt.base.total;
  1077		ppgtt->base.cleanup = gen8_ppgtt_cleanup;
  1078		ppgtt->base.allocate_va_range = gen8_alloc_va_range;
  1079		ppgtt->base.insert_entries = gen8_ppgtt_insert_entries;
  1080		ppgtt->base.clear_range = gen8_ppgtt_clear_range;
  1081		ppgtt->base.unbind_vma = ppgtt_unbind_vma;
  1082		ppgtt->base.bind_vma = ppgtt_bind_vma;
  1083	
  1084		ppgtt->switch_mm = gen8_mm_switch;
  1085	
> 1086		ret = __pdp_init(false, &ppgtt->pdp);
  1087	
  1088		if (ret)
  1089			goto free_scratch;
  1090	
  1091		return 0;
  1092	
  1093	free_scratch:
  1094		gen8_free_scratch(&ppgtt->base);

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