genlib/io.py: fix copy/paste error (thanks rjo)

diff --git a/migen/genlib/io.py b/migen/genlib/io.py
index ecd061fa96da292be90ceed02c033e18ec99f478..ab0c3beddbdefddd814f2fc7aa70668e3f7891cd 100644 (file)
--- a/migen/genlib/io.py
+++ b/migen/genlib/io.py
@@ -16,4 +16,4 @@ class DifferentialInput(Special):
 
        @staticmethod
        def lower(dr):
-               raise NotImplementedError("Attempted to use a reset synchronizer, but platform does not support them")
+               raise NotImplementedError("Attempted to use a differential input, but platform does not support them")