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

AlexeyAB

2018-05-22 768b190b10e61932d78547e44aa9475ae950e409

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classes=1000
train  = /data/imagenet/imagenet1k.train.list
valid  = /data/imagenet/imagenet1k.valid.list
backup = /home/pjreddie/backup/
labels = data/imagenet.labels.list
names  = data/imagenet.shortnames.list
top=5