trace-graph: Do not depend on wakeup success field
trace-graph: Do not depend on wakeup success field

The "success" field of the wakeup events is going away,
don't depend on them there. If they don't exist, then the
wakeup was successful, so treat it as such.

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

bigzz/trace-cmd,bigzz/trace-cmd