drm: introduce pipe color correction properties

[Dan Carpenter]

Hello Lionel Landwerlin,

The patch 5488dc16fde7: "drm: introduce pipe color correction
properties" from Feb 26, 2016, leads to the following static checker
warning:

	drivers/gpu/drm/drm_atomic_helper.c:2933 drm_atomic_helper_legacy_gamma_set()
	error: 'blob' dereferencing possible ERR_PTR()

drivers/gpu/drm/drm_atomic_helper.c
  2924          blob = drm_property_create_blob(dev,
  2925                                          sizeof(struct drm_color_lut) * size,
  2926                                          NULL);
  2927          if (!blob) {

This should be a check for IS_ERR().

  2928                  ret = -ENOMEM;
  2929                  goto fail;

"goto fail" heh...

  2930          }
  2931  
  2932          /* Prepare GAMMA_LUT with the legacy values. */
  2933          blob_data = (struct drm_color_lut *) blob->data;
  2934          for (i = 0; i < size; i++) {

regards,
dan carpenter