routing.cpp: removed the this==NULL check
routing.cpp: removed the this==NULL check

In C++, calling a method on a null pointer is already undefined
behavior, so the check does not really help us. Plus it triggers
a -Wnonnull-compare warning because 'this' pointer is marked as
being non-null...

vicoslab/echolib,vicoslab/echolib,vicoslab/echolib