16eeac356c
* Binder object may become null between null check and actual invocation if using a instance private variable assignable by service connection callbacks * The solution to this problem without locking is to assign existing binder variable to a local final variable before the null check * Any further invocation to a disconnected binder object will result in RemoteException that is caught by the try-catch block * Read and write to volatile variable is always atomic and hence thread-safe * Removed unnecessary synchronization in BluetoothAdapter constructor * Private mConnection objects should be final * Simplfied several return statements where booleans can be returned directly * Removed unnecessary catches for NPE since there won't be any Bug: 64724692 Test: make, pair and use devices, no functional change Change-Id: Ifc9d6337c0d451a01484b61243230725d5314f8e