Check the "maximum recursion depth exceeded" message directly in the …

…error `args`

No further decoding is needed here now.

_pytest/_code/code.py

@@ -580,10 +580,7 @@ def repr_traceback(self, excinfo):
             traceback = traceback.filter()
         recursionindex = None
         if excinfo.errisinstance(RuntimeError):
-            error_message = excinfo.value.message
-            if isinstance(error_message, bytes):  # python 2 only
-                error_message = error_message.decode(errors='replace')
-            if "maximum recursion depth exceeded" in error_message:
+            if "maximum recursion depth exceeded" in excinfo.value.args:
                 recursionindex = traceback.recursionindex()
         last = traceback[-1]
         entries = []