DbDriver: removed not used KillCleanup method

git-svn-id: http://rtabmap.googlecode.com/svn/trunk/rtabmap@801 f169173b-cf89-36c8-b27e-44dbe73f0c83

corelib/include/rtabmap/core/DBDriver.h

@@ -137,7 +137,6 @@ private:
 
 	//thread stuff
 	virtual void mainLoop();
-	virtual void killCleanup();
 
 private:
 	UMutex _transactionMutex;

corelib/src/DBDriver.cpp

@@ -102,10 +102,6 @@ void DBDriver::mainLoop()
 	this->kill(); // Do it only once
 }
 
-void DBDriver::killCleanup()
-{
-}
-
 void DBDriver::beginTransaction() const
 {
 	_transactionMutex.lock();