logd: clear timeout if no start time is given

This code was accidentally deleted in the refactoring of
06e478b52e603a0175d24c2965e0039d63aa5207 cause the
logd.timeout_no_start test to start failing.

Bug: 117942520
Test: logd unit tests
Change-Id: Id7994230a89d7f8c2cb1f36a8ca1175a6b398de0
1 file changed
tree: 6ec74e6926e33a728d5ca9d3a7ab41c9a7e5f0c0
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/