Minor fix for Web Cam on OpenCV 3.x

AlexeyAB

2018-04-06 1b1221ace5f49b5b464cf7f4ff89f31cf03d3da1

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classes=21842
train  = /data/imagenet/imagenet22k.train.list
valid  = /data/imagenet/imagenet22k.valid.list
backup = /home/pjreddie/backup/
labels = data/imagenet.labels.list
names  = data/imagenet.shortnames.list
top = 5