[drm-intel:drm-intel-next-queued 5/7] drivers/gpu/drm/i915/display/intel_color.c:1535 i9xx_read_lut_8() error: potential null dereference 'blob'. (drm_property_create_blob returns null)

[kbuild test robot]

tree:   git://anongit.freedesktop.org/drm-intel drm-intel-next-queued
head:   4bb6a9d5d9a8289673c4cb0786d44be8a63c21db
commit: 1af22383829864299102ca0c2eab458f755a9971 [5/7] drm/i915/display: Extract i9xx_read_luts()

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp at intel.com>

smatch warnings:
drivers/gpu/drm/i915/display/intel_color.c:1535 i9xx_read_lut_8() error: potential null dereference 'blob'.  (drm_property_create_blob returns null)

vim +/blob +1535 drivers/gpu/drm/i915/display/intel_color.c

  1518	
  1519	static struct drm_property_blob *
  1520	i9xx_read_lut_8(const struct intel_crtc_state *crtc_state)
  1521	{
  1522		struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
  1523		struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
  1524		enum pipe pipe = crtc->pipe;
  1525		struct drm_property_blob *blob;
  1526		struct drm_color_lut *blob_data;
  1527		u32 i, val;
  1528	
  1529		blob = drm_property_create_blob(&dev_priv->drm,
  1530						sizeof(struct drm_color_lut) * LEGACY_LUT_LENGTH,
  1531						NULL);
  1532		if (IS_ERR(blob))
  1533			return NULL;
  1534	
> 1535		blob_data = blob->data;
  1536	
  1537		for (i = 0; i < LEGACY_LUT_LENGTH; i++) {
  1538			if (HAS_GMCH(dev_priv))
  1539				val = I915_READ(PALETTE(pipe, i));
  1540			else
  1541				val = I915_READ(LGC_PALETTE(pipe, i));
  1542	
  1543			blob_data[i].red = intel_color_lut_pack(REG_FIELD_GET(
  1544								LGC_PALETTE_RED_MASK, val), 8);
  1545			blob_data[i].green = intel_color_lut_pack(REG_FIELD_GET(
  1546								  LGC_PALETTE_GREEN_MASK, val), 8);
  1547			blob_data[i].blue = intel_color_lut_pack(REG_FIELD_GET(
  1548								 LGC_PALETTE_BLUE_MASK, val), 8);
  1549		}
  1550	
  1551		return blob;
  1552	}
  1553	

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