Minor fix: warning-message if in labels class_id >= classes in cfg-file

AlexeyAB

2018-05-22 768b190b10e61932d78547e44aa9475ae950e409

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./darknet detector demo ./cfg/coco.data ./cfg/yolov2.cfg ./yolov2.weights test50.mp4 -i 0 -thresh 0.25