drm/i915: Remove chatty execbuf failure message.

Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org> (in principle)
Signed-off-by: Eric Anholt <eric@anholt.net>

drivers/gpu/drm/i915/i915_gem.c

@@ -4051,8 +4051,6 @@ i915_gem_execbuffer(struct drm_device *dev, void *data,
 				  "back to user (%d)\n",
 				  args->buffer_count, ret);
 		}
-	} else {
-		DRM_ERROR("i915_gem_do_execbuffer returns %d\n", ret);
 	}
 
 	drm_free_large(exec_list);