drm: modify drm_global_item_ref to avoid two times of writing ref->object
In previous drm_global_item_ref, there are two times of writing ref->object if item->refcount is 0. So this patch does a minor update to put alloc and init ref firstly, and then to modify the item of glob array. Use "else" to avoid two times of writing ref->object. It can make the code logic more clearly. Reviewed-by: NChristian König <christian.koenig@amd.com> Signed-off-by: NHuang Rui <ray.huang@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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