binsacii: unhexlify: Raise ValueError.

binascii/binascii.py

@@ -2,7 +2,7 @@ from ubinascii import hexlify
 
 def unhexlify(data):
     if len(data) % 2 != 0:
-        raise Exception("Odd-length string")
+        raise ValueError("Odd-length string")
 
     return bytes([ int(data[i:i+2], 16) for i in range(0, len(data), 2) ])