Avoid onServiceDisconnected() for unbind Service

onServiceDisconnected() and unbindLocked() both
are responsible to make mRemoteInstanceas null,
so ensure that the service is not unbinded already
while calling onServiceDisconnected()

Fixes:111631529
Test: Build Successful and device Running.
Change-Id: I505d97e32c4e76f06a358850e91fe189bf02654c
1 file changed