Fix for b/411488376

Loop back around for another check of the stack if we detect a quitting
condition during nextMessage(). Otherwise we may miss an item added in
between our stack drain and the setting of quitting to true.

Bug: 411488376
Flag: build.RELEASE_PACKAGE_MESSAGEQUEUE_IMPLEMENTATION
Test: atest MessageQueueTest
Change-Id: I12bc300db8c3660214769874bde08b08ea1fbc16