[PATCH 41] convert ptrace_report_exit()

[Roland McGrath]

> Change ptrace_report_exit() to use ptrace_event.

Leaving aside my reservations about the whole plan, this is the most
concise example yet of how you are introducing duplicate boilerplate
all over the place where it ought to be written to share the code.
Even repeating "(event << 8) | SIGTRAP" is obviously ugly.

utrace_ptrace_event is the right abstraction.  
Add the other field initializers as arguments.


Thanks,
Roland