bpf: Skip task with pid=1 in sendsignalcommon()
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 v5.15.92 by commit 0dfef503133565fa0bcf3268d8eeb5b181191a65. For more details please see the references link.