udf: Fix NULL pointer dereference in udf_symlink function

udf: Fix NULL pointer dereference in udf_symlink function

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 v5.13.3 by commit 5150877e4d99f85057a458daac7cd7c01005d5c6. For more details please see the references link.