!10249 fbdev: savage: Handle err return when savagefb_check_var failed

Merge Pull Request from: @ci-robot 
 
PR sync from: heyujie <coka.heyujie@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/YFO7NDJOKH2YHWNP4JDMJZW7GLPAUQY2/ 
 
https://gitee.com/src-openeuler/kernel/issues/IAB0KC 
 
Link:https://gitee.com/openeuler/kernel/pulls/10249

 

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