[LU-12147] statone utility doesn't form correct string with gcc8

• Type: Bug
• Resolution: Fixed
• Priority: Trivial
• Fix Version/s: Lustre 2.13.0

Environment

the following code:
        strncpy(parent, base, t - base);
        offset = t - base - 1;
leaves parent with no terminating null with gcc8
and this breaks tests like recovery-small

• Severity: 3
• Assignee: Alex Zhuravlev
• Reporter: Alex Zhuravlev