drm/i915/gvt: do not ignore return value of create_scratch_page

Function create_scratch_page() may fail in some cases.
Signed-off-by: NDu, Changbin <changbin.du@intel.com>
Signed-off-by: NZhenyu Wang <zhenyuw@linux.intel.com>

drivers/gpu/drm/i915/gvt/gtt.c

@@ -1995,8 +1995,7 @@ int intel_vgpu_init_gtt(struct intel_vgpu *vgpu)
 
 	gtt->ggtt_mm = ggtt_mm;
 
-	create_scratch_page(vgpu);
-	return 0;
+	return create_scratch_page(vgpu);
 }
 
 /**