Fixed uses of WebCam for OpenCV 3.x

AlexeyAB

2018-03-20 fe4f01b1d8cce9762e47aaf42b6e17a3427a144b

 src/detection_layer.c

@@ -59,7 +59,7 @@
            for (i = 0; i < locations; ++i) {
                int offset = i*l.classes;
                softmax(l.output + index + offset, l.classes, 1,
                        l.output + index + offset);
                        l.output + index + offset, 1);
            }
        }
    }