nilfs2: fix deadlock in nilfscountfree_blocks()
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v4.19.267 by commit f0cc93080d4c09510b74ecba87fd778cca390bb1, it was introduced in version v2.6.38 by commit e828949e5b42bfd234ee537cdb7c5e3a577958a3. For more details please see the references link.