Fixes coccicheck warning:

drivers/bus/ti-sysc.c:506:1-3: WARNING: PTR_ERR_OR_ZERO can be used
Reported-by: NHulk Robot <hulkci@huawei.com>
Signed-off-by: Nzhengbin <zhengbin13@huawei.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>