CVE-2022-50553 tracing/hist: Fix out-of-bound write on 'action_data.var_ref_idx'

In the Linux kernel, the following vulnerability has been resolved: tracing/hist: Fix out-of-bound write on 'actiondata.varrefidx' When generate a synthetic event with many params and then create a trace action for it 1, kernel panic happened 2. It is because that in traceactioncreate...