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/test/app/PayStrand_test.cpp

@@ -531,7 +531,7 @@ struct ExistingElementPool
                 return STAmount{};
             return (*sle)[sfBalance];
         };
-        std::uint64_t totalXRP[2];
+        std::uint64_t totalXRP[2]{};
         for (auto ai1 = accounts.begin(), aie = accounts.end(); ai1 != aie;
              ++ai1)
         {