Fix DscpPolicyTest EBADF

FdEventsReader#stop() calls FdEventsReader#unregisterAndDestroyFd()
which then races against the Os.close() call. If
unregisterAndDestroyFd() gets executed second, it silently ignores the
exception. Removing superfluous Os.close() to fix this.

Test: atest android.net.cts.DscpPolicyTest
Change-Id: I467bbbb29326a1ff5df8565a3e3517a419deec45
1 file changed