Fix webcam memory leak

AlexeyAB

2018-05-04 4232ace376f6b6fd9df846d5c362d93a0e5eec16

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#rm test_dnn_out.avi
 
./darknet detector demo ./cfg/coco.data ./cfg/yolov3.cfg ./yolov3.weightss rtsp://admin:admin12345@192.168.0.228:554 -i 0 -thresh 0.25