fixed text in assert

src/processor/processor_base.cpp

@@ -81,7 +81,7 @@ void ProcessorBase::remove()
 
 void ProcessorBase::link(SensorBasePtr _sen_ptr)
 {
-    assert(this->getSensor() == nullptr && "linking an already linked landmark");
+    assert(this->getSensor() == nullptr && "linking an already linked processor");
 
     if(_sen_ptr)
     {