drm/i915: Correct error handling for i915_gem_object_create_from_data()

i915_gem_object_create_from_data() always returns an error pointer on
failure, there is no need to check against NULL.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170317205317.7885-1-chris@chris-wilson.co.ukReviewed-by: Matthew Auld <matthew.auld@intel.com>

drivers/gpu/drm/i915/intel_uc.c

@@ -377,8 +377,8 @@ void intel_uc_prepare_fw(struct drm_i915_private *dev_priv,
 			uc_fw->major_ver_wanted, uc_fw->minor_ver_wanted);
 
 	obj = i915_gem_object_create_from_data(dev_priv, fw->data, fw->size);
-	if (IS_ERR_OR_NULL(obj)) {
-		err = obj ? PTR_ERR(obj) : -ENOMEM;
+	if (IS_ERR(obj)) {
+		err = PTR_ERR(obj);
 		goto fail;
 	}