Minor cleanups:

* Make sure variables are always initialized
* Use lround instead of adding .5 and casting
* Remove some unneeded vars
* Check for null before calling strcmp
* Remove redundant if conditions
* Remove make_TxQ factory function

src/ripple/app/misc/impl/TxQ.cpp

@@ -1549,10 +1549,4 @@ setup_TxQ(Config const& config)
     return setup;
 }
 
-std::unique_ptr<TxQ>
-make_TxQ(TxQ::Setup const& setup, beast::Journal j)
-{
-    return std::make_unique<TxQ>(setup, j);
-}
-
 }  // namespace ripple