bzfs: Fix timestamp buffer overrun on Linux with -ts micros
bzfs: Fix timestamp buffer overrun on Linux with -ts micros

Backported from r20103, part of r19161

kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1