probe::sunrpc.sched.release_task - Release all resources associated with a task

rpc_release_task function might not be found for a particular kernel. So, if we can't find it, just
       return '-1' for everything.

       probe::sunrpc.sched.release_task - Release all resources associated with a task

tapset::rpc(3stap)

SystemTap Tapset Reference                         April 2024                          PROBE::SUNRPC.SCHE(3stap)

       sunrpc.sched.release_task

prot
           the IP protocol in the RPC call

       vers
           the program version in the RPC call

       tk_flags
           the flags of the task

       prog
           the program number in the RPC call

       xid
           the transmission id in the RPC call