Fix webcam memory leak

AlexeyAB

2018-05-04 4232ace376f6b6fd9df846d5c362d93a0e5eec16

 src/image.c

@@ -917,6 +917,7 @@
   cvResize(src, new_img, CV_INTER_LINEAR);
   image im = ipl_to_image(new_img);
   cvReleaseImage(&new_img);
   if (use_webcam) cvReleaseImageHeader(&src);
   rgbgr_image(im);
   return im;
}