exif: protect against EXIF data overflow #1070
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Relates #1042.
26ec395 resolved #1042 with protection against EXIF overflow in the JPEG encoder.
However the report at #1042 was against the PNG encoder. That is addressed at #1052. The review for that identified that its possible to get an overflow in the
size += 4, and it looks like that is possible in the JPEG version too.This PR incorporates the same fix as suggested for #1052.