init: Combine two if-statements

Combine two if-statements. This change is fine because:
* The code between the two if-statements does not queue actions.
* If an action is queued from another thread then WakeMainInitThread()
  is called after the action has been queued.

Bug: 266255006
Change-Id: Id4b9565ff4fdb3ee2a2bbca316c8c78e0f2d38dd
Signed-off-by: Bart Van Assche <bvanassche@google.com>