Problem: inconsistent naming style for private data members, conflicts with naming of local variables and member functions

Solution: apply and check _lower_case naming style for private data members

src/pull.hpp

@@ -58,7 +58,7 @@ class pull_t : public socket_base_t
 
   private:
     //  Fair queueing object for inbound pipes.
-    fq_t fq;
+    fq_t _fq;
 
     pull_t (const pull_t &);
     const pull_t &operator= (const pull_t &);