re: ktrace -p nonexistent process causes a panic

[matthew green <mrg%eterna.com.au@localhost>]

ignore the previous:

> either way fp is garbage on the stack at this point if not
> KTROP_CLEAR.  the uses in ktrace_common() won't fault, but the
> fd_abort()s will (which is where we see the panic).
> 
> can people see if this works ok if fp is initialised to NULL?
> (either at the top of the function or preferably as an else
> clause right above the call to ktrace_common().

i was looking at the fp decl in sys_fktrace() here.  fp is
initialised to NULL correctly in sys_ktrace().


.mrg.