f2fs: prevent kernel warning due to negative i_nlink from corrupted image

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UBUNTU-CVE-2024-53690

In the Linux kernel, the following vulnerability has been resolved: nilfs2: prevent use of deleted inode syzbot reported a WARNING in nilfsrmdir. 1 Because the inode bitmap is corrupted, an inode with an inode number that should exist as a ".nilfs" file was reassigned by nilfsmkdir for "file0",...