Fixed Coverity issue.
Fixed Coverity issue.

CID 11692: Uninitialized scalar field (UNINIT_CTOR)
Non-static class member _allocationMode is not initialized in this constructor nor in any functions that it calls.



stmh/osg,ntoand/osg,omega-hub/osg,stmh/osg,koshman86/osg,ghub/osg,stmh/osg,omega-hub/osg,stmh/osg,ntoand/osg,artoolkit/osg,ghub/osg,XiaoCC/osg,ghub/osg,artoolkit/osg,artoolkit/osg,koshman86/osg,XiaoCC/osg,ghub/osg,ntoand/osg,koshman86/osg,ntoand/osg,omega-hub/osg,omega-hub/osg,XiaoCC/osg,koshman86/osg,stmh/osg,XiaoCC/osg,artoolkit/osg,XiaoCC/osg