drm/i915: fix i915_gem_object_wait_moving_fence

All of CI is just failing with the following, which prevents loading of
the module:

    i915 0000:03:00.0: [drm] *ERROR* Scratch setup failed

Best guess is that this comes from the pin_map() for the scratch page,
which does an i915_gem_object_wait_moving_fence() somewhere. It looks
like this now calls into dma_resv_wait_timeout() which can return the
remaining timeout, leading to the caller thinking this is an error.

v2(Lucas): handle ret == 0

Fixes: 1d7f5e6c ("drm/i915: drop bo->moving dependency")
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Christian König <christian.koenig@amd.com> #v1
Link: https://patchwork.freedesktop.org/patch/msgid/20220408084205.1353427-1-matthew.auld@intel.comSigned-off-by: Christian König <christian.koenig@amd.com>

drivers/gpu/drm/i915/gem/i915_gem_object.c

@@ -771,9 +771,16 @@ int i915_gem_object_get_moving_fence(struct drm_i915_gem_object *obj,
 int i915_gem_object_wait_moving_fence(struct drm_i915_gem_object *obj,
 				      bool intr)
 {
+	long ret;
+
 	assert_object_held(obj);
-	return dma_resv_wait_timeout(obj->base. resv, DMA_RESV_USAGE_KERNEL,
+
+	ret = dma_resv_wait_timeout(obj->base. resv, DMA_RESV_USAGE_KERNEL,
 				    intr, MAX_SCHEDULE_TIMEOUT);
+	if (!ret)
+		ret = -ETIME;
+
+	return ret < 0 ? ret : 0;
 }
 
 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)