Close duped file number after use: fix #178
Close duped file number after use: fix #178

Problem:

    - When an invalid image path is given, stderr is used and never closed

How to reproduce:

    - Give non-existing image file path

Fix:

    - Close it!

otiai10/gosseract,otiai10/gosseract,otiai10/gosseract,otiai10/gosseract