Lorenzo Colitti 31e19f34f5 Don't attempt to stop the receive thread if we never started it.
If socket initialization fails, DhcpState#exit will call
mReceiveThread#stop and crash the system with an NPE. Make sure
we don't do that if mReceiveThread is null, and properly null it
out when exiting.

Bug: 23088314
Change-Id: I4378d8280f9d8588f5eaa8bd7ade61beab1c3ce2
2015-08-11 15:42:59 +09:00
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