[spec] FromHex: refactor (#46)

spec.html

@@ -332,14 +332,12 @@ <h1>
       1. If _length_ modulo 2 is not 0, throw a *SyntaxError* exception.
       1. Let _bytes_ be « ».
       1. Let _index_ be 0.
-      1. Repeat, while _index_ &lt; _length_,
+      1. Repeat, while _index_ &lt; _length_ and the length of _bytes_ &lt; _maxLength_,
         1. Let _hexits_ be the substring of _string_ from _index_ to _index_ + 2.
         1. If _hexits_ contains any code units which are not in *"0123456789abcdefABCDEF"*, throw a *SyntaxError* exception.
         1. Set _index_ to _index_ + 2.
         1. Let _byte_ be the integer value represented by _hexits_ in base-16 notation, using the letters A-F and a-f for digits with values 10 through 15.
         1. Append _byte_ to _bytes_.
-        1. If the length of _bytes_ is _maxLength_, then
-          1. Return the Record { [[Read]]: _index_, [[Bytes]]: _bytes_ }.
       1. Return the Record { [[Read]]: _index_, [[Bytes]]: _bytes_ }.
     </emu-alg>
   </emu-clause>