It is to improve the readability of calls to osl::Thread::wait.

Change-Id: I025d89abf8e84ca73ba08f001be3f45b86c89957
Signed-off-by: Gurkaran <gurkran@gmail.com>
Reviewed-on: https://gerrit.libreoffice.org/23416Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>