Fix unhandled negative resize augmentation #8565
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Changes
Summary
Fixes a rare bug when augmenting an image relative to model resolution. It was possible to attempt to augment an image to have negative width or height.
When this is handled in OpenCV the augment fails, and this error is produced (but was swallowed):
The Mat is then freed, and Darknet doesn't recreate a fresh one, causing the loss to jump up (effectively breaking the training) as the Mat is no longer updated.
