GSD-2022-1006547 ext4: fix bug in extents parsing when eh_entries == 0 and eh_depth > 0

ext4: fix bug in extents parsing when ehentries == 0 and ehdepth 0 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 v5.15.71 by commit...