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Detach pollThread only if it is joinable
sensor HAL is not required for Android TV. Hence, ISensors returned from getService() was null and pollThread was not associated with any thread of execution. Bug: 120910004 Test: run vts -m VtsHalSensorsV1_0Target Change-Id: If16af7313ff7bb22e5ca16c03a0fee0b8d733335