fixed unused variable warning

src/Ydayarith.cc

@@ -179,7 +179,7 @@ Ydayarith(void *process)
 {
   ModuleYdayarith ydayarith;
   ydayarith.init(process);
-  int success = ydayarith.run();
+  ydayarith.run();
   ydayarith.close();
 
   return nullptr;