trace-cmd: Do not die if seting pid for sched events fails
trace-cmd: Do not die if seting pid for sched events fails

Older kernels do not handle filtering well. The -F flag causes the
filter to sched_wakeup and sched_switch to be set for next pid,
and if it fails to set, just ignore it. It should not interfere with
the trace anyway.

Signed-off-by: Steven Rostedt <43232e92d70cc7aa53504ad0397085ee47bad87f@goodmis.org>

bigzz/trace-cmd,bigzz/trace-cmd