hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5QQPG
CVE: NA

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Add a size-0-check in mg_sp_make_share_k2u() to avoid passing 0-size spa
to __insert_sp_area().
Signed-off-by: NGuo Mengqi <guomengqi3@huawei.com>
Reviewed-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NYongqiang Liu <liuyongqiang13@huawei.com>