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

AlexeyAB

2018-05-22 768b190b10e61932d78547e44aa9475ae950e409

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classes= 80
train  = /home/pjreddie/data/coco/trainvalno5k.txt
valid  = coco_testdev
#valid = data/coco_val_5k.list
names = data/coco.names
backup = /home/pjreddie/backup/
eval=coco