mm/damon/dbgfs: avoid duplicate context directory creation
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 v5.15.64 by commit ddcb0696136b9af1c8d489fd4763e12f52864b95, it was introduced in version v5.15 by commit 75c1c2b53c78bf3b3188ebb7b3508dadbf98bba1. For more details please see the references link.