py3: converts bytes to pycompat.bytestr to get bytechrs while enumerating

Differential Revision: https://phab.mercurial-scm.org/D2270

mercurial/pure/base85.py

@@ -53,6 +53,7 b' def b85decode(text):'
     out = []
     for i in range(0, len(text), 5):
         chunk = text[i:i + 5]
+        chunk = pycompat.bytestr(chunk)
         acc = 0
         for j, c in enumerate(chunk):
             try: