drm/i915: Suppress a WARN on reading an object back for a GPU hang

Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: NMika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_gpu_error.c

@@ -577,7 +577,10 @@ i915_error_object_create(struct drm_i915_private *dev_priv,
 	if (dst == NULL)
 		return NULL;
 
-	dst->gtt_offset = i915_gem_obj_offset(src, vm);
+	if (i915_gem_obj_bound(src, vm))
+		dst->gtt_offset = i915_gem_obj_offset(src, vm);
+	else
+		dst->gtt_offset = -1;
 
 	reloc_offset = dst->gtt_offset;
 	use_ggtt = (src->cache_level == I915_CACHE_NONE &&