Fixing bug/race in t.stat pushed in previous cleanup fix to bk _stat / bk _lstat.
Fixing bug/race in t.stat pushed in previous cleanup fix to
bk _stat / bk _lstat.

bk: 468a810340P30A15vstdTfvIzEVL_w
bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper