net-thunder: One check less in nicvf_register_interrupts() after error detection

[Joe Perches]

On Thu, 2016-01-07 at 20:56 +0100, SF Markus Elfring wrote:
> > > Is it a bit more efficient to avoid a double check for the
> > > variable "ret" at the end of the current implementation for the
> > > discussed function?
> > 
> > Before asking questions you could answer yourself,
> > please look at object code produced by the compiler
> > before and after your proposed changes.
> 
> * Do any more source code reviewers wonder about the need
>   for such a double check?

Given the feedback you've already received,
it seems so.

> * Which object code representations would you find representative
>   for a further constructive discussion around this
>   software component?

Evidence of actual object code improvement when
with compiled with optimizations.