ext4: fix null-ptr-deref in ext4writeinfo
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 v5.4.220 by commit 3638aa1c7d87c0ca0aef23cf58cae2c48e7daca4. For more details please see the references link.