Fix FindBugs issues

IntProperty: Infinite recursive loop
SQLiteSession: Null pointer dereference
UsbStoreActivity: Null pointer derefence
LocationManagerService: No relationship between generic parameter and method argument
ActivityManagerService: Call to equals() comparing different types
ChooseAccountTypeActivity: Possible null pointer dereference
RuimRecords: Possible null pointer derefence

Change-Id: I9d631c50c30eb98e32cca5a5085513b6904db676
SystemUI: Use Settings.Global.getInt to read global settings

Settings.Global.getInt should be used instead of Settings.Secure.getInt
to read global settings.

Change-Id: Icf8b9b2c9f04d4a111e5cc165e090aeb996f91b1