Initialize libtiff buffer when saving #6699
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This reverts commit a3e61c1.
hugovk force-pushed the security-libtiff_buffer branch from 7ff3ba2 to 744f455 Compare 
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When saving a TIFF image to a file object using libtiff, the buffer was not initialized. This behaviour introduced in Pillow 2.0.0, and has now been fixed.