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tiffcrop: Do not reuse input buffer for subsequent images. Fix issue 527

Su Laus requested to merge Su_Laus/libtiff:tiffcrop_dont_reuse_input_buffer_fix_527 into master

tiffcrop: Do not reuse input buffer for subsequent images. Fix issue 527

Reuse of read_buff within loadImage() from previous image is quite unsafe, because other functions (like rotateImage() etc.) reallocate that buffer with different size without updating the local prev_readsize value.

Closes #527 (closed)

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