Fix the bugs of 3SNIC driver compilation failure while using clang

3snic inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7PGHA


CVE: NA

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1.fix a serial of uninitialized bugs
2.fix the bug that expression does not compute the number of elements

Reviewed-by: Chen Mou <chenmou@3snic.com>
Reviewed-by: Wan Renyong <wanry@3snic.com>
Reviewed-by: Yang Gan <yanggan@3snic.com>
Reviewed-by: Wen Liang <wenliang@3snic.com>
Signed-off-by: Steven Song <steven.song@3snic.com>