!6203 ALSA: usb-audio: fix null pointer dereference on pointer cs_desc

Merge Pull Request from: @ci-robot 
 
PR sync from: Liu Shixin <liushixin2@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/3TAMQ6RLMBV7O6X7VM774PIHLAHBRAZR/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9FNFQ 
 
Link:https://gitee.com/openeuler/kernel/pulls/6203

 

Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>