[PATCH] linux: spawni.c: simplify error reporting to parent

[Florian Weimer]

* Adhemerval Zanella:

> On 23/09/2016 16:09, Rasmus Villemoes wrote:
>> On Fri, Sep 23 2016, Florian Weimer <fw@deneb.enyo.de> wrote:
>> 
>>> * Rasmus Villemoes:
>>>
>>>> +      ec = args.err;
>>>> +      assert (ec >= 0);
>>>> +      if (ec != 0)
>>>> +	  __waitpid (new_pid, NULL, 0);
>>>
>>> One minor issue: Now that the variable name “ec” appears in an
>>> assertion, it is a good idea to rename it to “error_code_from_child“
>>> or something similar, so that the assertion message is more
>>> meaningful.
>> 
>> IMO, that's already addressed by the comments above the initialization
>> in the parent and exit path in the child. An assert message would have
>> to be overly verbose to make sense without the context of the code it
>> appears in. In any case, error_code_from_child is a bad name if we hit
>> the "ec = -new_pid" branch.
>
> Also, if CLONE_VM is not really creating a thread with shared VM it means
> something really broken in the system.

Agreed.  I have no objections anymore to the patch as-is.