build: io: SDRIO/Tristate: check len after wrap

check len after wrap, because len won't work on int and bool.

Signed-off-by: Fin Maaß <f.maass@vogl-electronic.com>

litex/build/io.py

@@ -84,14 +84,14 @@ def __init__(self, i, o, clk):
 
 class SDRIO(Special):
     def __init__(self, i, o, clk=None):
-        assert len(i) == len(o)
         Special.__init__(self)
         self.i            = wrap(i)
         self.o            = wrap(o)
         if clk is None:
             clk = ClockSignal()
         self.clk          = wrap(clk)
         self.clk_domain   = None if not hasattr(clk, "cd") else clk.cd
+        assert len(self.i) == len(self.o)
 
     def iter_expressions(self):
         yield self, "i"  , SPECIAL_INPUT