[Click] Make SetUDPChecksum more verbose when something is wrong

[Eddie Kohler]

Hi Bart,

Totally reasonable.  A patch to this effect is checked in.
E


Bart Braem wrote:
> Hi,
> 
> SetUDPChecksum now uses checked_output_push to output packets it can  
> not checksum. However, it would be nice if some warning would be  
> output, this silent behaviour is quite hard to debug. I suggest giving  
> a warning when packets are in this case, based on a verbose keyword  
> that defaults to on.
> 
> Regards,
> Bart Braem