Fallback to not using mmap if buffer is not large enough #6510
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Resolves #6507
The issue found an image that hits
Pillow/src/map.c
Lines 116 to 117 in 6b35dc2
However, that is when it uses mmap, and the image loads correctly without mmap. The explanation would be that the image is truncated, but not critically so.
This PR copies the "buffer is not large enough" into Python, and switches back to normal image loading if the condition fails.
The test image was created by copying one of our existing test images and truncating.