Add const qualifier to OpenNI2DeviceInfoComparator::operator()
Add const qualifier to OpenNI2DeviceInfoComparator::operator()

Fix compiler error C3848 in VC14 (Release configuration) when
WITH_OPENNI2 is selected.
Add const qualifier to OpenNI2DeviceInfoComparator::operator() for fix
this problem.

locnx1984/pcl,Tabjones/pcl,chenxingzhe/pcl,simonleonard/pcl,KevenRing/pcl,Tabjones/pcl,raydtang/pcl,shyamalschandra/pcl,ipa-rmb/pcl,lebronzhang/pcl,wgapl/pcl,DaikiMaekawa/pcl,drmateo/pcl,shangwuhencc/pcl,shyamalschandra/pcl,locnx1984/pcl,simonleonard/pcl,kanster/pcl,LZRS/pcl,shyamalschandra/pcl,locnx1984/pcl,stefanbuettner/pcl,nikste/pcl,krips89/pcl_newfeatures,krips89/pcl_newfeatures,KevenRing/vlp,KevenRing/pcl,simonleonard/pcl,krips89/pcl_newfeatures,raydtang/pcl,wgapl/pcl,ipa-rmb/pcl,drmateo/pcl,MMiknis/pcl,drmateo/pcl,locnx1984/pcl,stfuchs/pcl,ipa-rmb/pcl,chenxingzhe/pcl,stfuchs/pcl,KevenRing/vlp,simonleonard/pcl,locnx1984/pcl,cascheberg/pcl,the-glu/pcl,starius/pcl,LZRS/pcl,shangwuhencc/pcl,lebronzhang/pcl,cascheberg/pcl,shangwuhencc/pcl,stfuchs/pcl,shangwuhencc/pcl,chenxingzhe/pcl,nikste/pcl,damienjadeduff/pcl,KevenRing/pcl,mikhail-matrosov/pcl,krips89/pcl_newfeatures,kanster/pcl,LZRS/pcl,shangwuhencc/pcl,raydtang/pcl,mikhail-matrosov/pcl,shyamalschandra/pcl,stfuchs/pcl,MMiknis/pcl,raydtang/pcl,kanster/pcl,mikhail-matrosov/pcl,simonleonard/pcl,stfuchs/pcl,damienjadeduff/pcl,wgapl/pcl,cascheberg/pcl,nikste/pcl,drmateo/pcl,DaikiMaekawa/pcl,stefanbuettner/pcl,lebronzhang/pcl,stefanbuettner/pcl,starius/pcl,DaikiMaekawa/pcl,mikhail-matrosov/pcl,Tabjones/pcl,nikste/pcl,ipa-rmb/pcl,KevenRing/vlp,damienjadeduff/pcl,MMiknis/pcl,kanster/pcl,KevenRing/pcl,wgapl/pcl,lebronzhang/pcl,the-glu/pcl,the-glu/pcl,starius/pcl,the-glu/pcl,damienjadeduff/pcl,KevenRing/vlp,cascheberg/pcl,raydtang/pcl,chenxingzhe/pcl,LZRS/pcl,LZRS/pcl,lebronzhang/pcl,kanster/pcl,stefanbuettner/pcl,krips89/pcl_newfeatures,chenxingzhe/pcl,the-glu/pcl,damienjadeduff/pcl,shyamalschandra/pcl,KevenRing/vlp,starius/pcl,KevenRing/pcl,cascheberg/pcl,Tabjones/pcl,Tabjones/pcl,mikhail-matrosov/pcl,DaikiMaekawa/pcl,drmateo/pcl,ipa-rmb/pcl,starius/pcl,nikste/pcl,stefanbuettner/pcl,MMiknis/pcl,MMiknis/pcl,DaikiMaekawa/pcl,wgapl/pcl