wip: simplify formatMessage internal logic

src/sha3.js

@@ -60,8 +60,10 @@
     : ArrayBuffer.isView;
 
   var formatMessage = function (message) {
-    var notString, type = typeof message;
-    if (type !== 'string') {
+    var type = typeof message;
+    if (type === 'string') {
+      return [message, false];
+    }
     if (type === 'object') {
       if (message === null) {
         throw new Error(INPUT_ERROR);
@@ -73,9 +75,7 @@
     } else {
       throw new Error(INPUT_ERROR);
     }
-      notString = true;
-    }
-    return [message, notString];
+    return [message, true];
   }
 
   var empty = function (message) {