!5961 fbdev: savage: Error out if pixclock equals zero

Merge Pull Request from: @ci-robot 
 
PR sync from: Cai Xinchen <caixinchen1@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/2JU2VALS4UOGL2SSONR6V6JGGKK5IECX/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9E2Y8 
 
Link:https://gitee.com/openeuler/kernel/pulls/5961

 

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