Address android.os.cts.FileObserverTest#testFileObserver

Ensure there are no events captured after stopWatching() is called on FileObserver.

Bug: 396034979
Change-Id: I7f428c892941daff71f08f21b4ba4f0b4a160ef0
Signed-off-by: huangdezhi@hihonor.com
Test: atest android.os.cts.FileObserverTest#testFileObserver
Flag: EXEMPT minor fix
1 file changed