tracing/hist: Fix out-of-bound write on 'actiondata.varref_idx'
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 v5.15.87 by commit 15697f653399253f9be4ed2a1e03d795f3cfee94, it was introduced in version v5.6 by commit d380dcde9a07ca5de4805dee11f58a98ec0ad6ff. For more details please see the references link.