fixed compilation error (without openni2)
fixed compilation error (without openni2)

MASKOR/rtabmap,srmanikandasriram/rtabmap,MASKOR/rtabmap,chen0510566/rtabmap,markusgrotz/rtabmap,markusgrotz/rtabmap,chen0510566/rtabmap,srmanikandasriram/rtabmap,markusgrotz/rtabmap,chen0510566/rtabmap,MASKOR/rtabmap,srmanikandasriram/rtabmap