!8464 i2c: smbus: fix NULL function pointer dereference

Merge Pull Request from: @ci-robot 
 
PR sync from: Jinjiang Tu <tujinjiang@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/C7T3GC2KUOPCXMGE3YXFQRBQCYBDKBCB/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9QRRJ 
 
Link:https://gitee.com/openeuler/kernel/pulls/8464

 

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