logd: clear timeout if no start time is given

This code was accidentally deleted in the refactoring of
4f22786cc9c9b22d353487678058e2075a968a9d cause the
logd.timeout_no_start test to start failing.

Bug: 117942520
Test: logd unit tests
Change-Id: Id7994230a89d7f8c2cb1f36a8ca1175a6b398de0
1 file changed