* 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
(cherry picked from commit 16eeac356c)
0146463d70