Negative i_size is never supported, although crafted images with inodes
having negative i_size will not lead to security issues in our current
codebase:
The following image can verify this (gzip+base64 encoded):
H4sICCmk4mYAA3Rlc3QuaW1nAGNgGAWjYBSMVPDo4dcH3jP2aTED2TwMKgxMUHHNJY/SQDQX
LxcDIw3tZwXit44MDNpQ/n8gQJZ/vxjijosPuSyZ0DUDgQqcZoKzVYFsDShbHeh6PT29ktTi
Eqz2g/y2pBFiLxDMh4lhs5+W4TAKRsEoGAWjYBSMglEwCkYBPQAAS2DbowAQAAA=
Mark as bad inodes for such corrupted inodes explicitly.
Signed-off-by: Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx>