probe::sunrpc.sched.release_task — Release all resources associated with a task
- the IP protocol in the RPC call
- the flags of the task
- the program version in the RPC call
- the transmission id in the RPC call
- the program number in the RPC call
rpc_release_taskfunction might not be found for a particular kernel. So, if we can't find it, just return '-1' for everything.