log: do not latch the roll off when logrotate won the race

The latch added in 456b3b4 treats every rename() failure as permanent. One
is not: if an external rotator moves debug.log between the size check and
the rename, the rename fails ENOENT. Nothing is wrong -- the file has just
been rotated by someone else, and the reopen above has already recreated
it -- but latching there would switch the cap off for the rest of the run
on a race the operator cannot see or fix.

Treat ENOENT as "already rotated" and carry on. It cannot loop: the reopen
leaves an empty file, so the next line's size check does not fire.

0 files changed, 0 insertions, 0 deletions