Overwrite sndfd and rcvfd objects by 0xcd when not used
Overwrite sndfd and rcvfd objects by 0xcd when not used

This  is useful for debugging purposes.

Signed-off-by: Martin Sustrik <4dd6061be1198639e8b05ce4fd5ead7a0dcaa0f4@250bpm.com>

TTimo/nanomsg,TTimo/nanomsg,reqshark/nanomsg,pch957/nanomsg,smithed/nanomsg,yan97ao/nanomsg,kaostao/nanomsg,pch957/nanomsg,imp/nanomsg,kaostao/nanomsg,cosin2008/nanomsg.NET,thisco-de/nanomsg,imp/nanomsg,kaostao/nanomsg,modulexcite/nanomsg,zerotacg/nanomsg,thisco-de/nanomsg,krafczyk/nanomsg,pch957/nanomsg,wfxiang08/nanomsg,hyperfact/nanomsg,wirebirdlabs/featherweight-nanomsg,gdamore/mamomsg,wfxiang08/nanomsg,yan97ao/nanomsg,nirs/nanomsg,ttyangf/nanomsg,linearregression/nanomsg,potatogim/nanomsg,smithed/nanomsg,modulexcite/nanomsg,tempbottle/nanomsg,nirs/nanomsg,smithed/nanomsg,imp/nanomsg,linearregression/nanomsg,featherweight/ftw-kernel-nanomsg,krafczyk/nanomsg,hyperfact/nanomsg,gdamore/mamomsg,simplestbest/nanomsg,gdamore/mamomsg,TTimo/nanomsg,pakozm/nanomsg,ttyangf/nanomsg,cosin2008/nanomsg.NET,snikulov/nanomsg,ttyangf/nanomsg,linearregression/nanomsg,hyperfact/nanomsg,modulexcite/nanomsg,tempbottle/nanomsg,zerotacg/nanomsg,JackDunaway/featherweight-nanomsg,reqshark/nanomsg,kaostao/nanomsg,snikulov/nanomsg,JackDunaway/featherweight-nanomsg,zerotacg/nanomsg,simplestbest/nanomsg,potatogim/nanomsg,reqshark/nanomsg,wfxiang08/nanomsg,krafczyk/nanomsg,smithed/nanomsg,ttyangf/nanomsg,simplestbest/nanomsg,yan97ao/nanomsg,potatogim/nanomsg,TTimo/nanomsg,wirebirdlabs/featherweight-nanomsg,wirebirdlabs/featherweight-nanomsg,featherweight/ftw-kernel-nanomsg,cosin2008/nanomsg.NET,tempbottle/nanomsg,pakozm/nanomsg,pakozm/nanomsg,JackDunaway/featherweight-nanomsg,nirs/nanomsg