!3733 drm/radeon: check the alloc_workqueue return value in radeon_crtc_init()

Merge Pull Request from: @ci-robot 
 
PR sync from: Yang Yingliang <yangyingliang@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/5BS5J55XZRFO74RE36QA2GSEGD2YYWO6/ 
 
https://gitee.com/src-openeuler/kernel/issues/I8T5EB 
 
Link:https://gitee.com/openeuler/kernel/pulls/3733

 

Reviewed-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>