bpf: Fix slot type check in checkstackwritevaroff
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 v5.15.86 by commit 3c58c83c6fc8a509b34d8b9d87537a4aa83b32e6, it was introduced in version v5.12 by commit 01f810ace9ed37255f27608a0864abebccf0aab3. For more details please see the references link.