bug fix in frappy.io.BytesIO.checkHWIdent

missing f for f string

Change-Id: Ie67384e5b7e514728041a72bd08c850abb31639e
Reviewed-on: https://forge.frm2.tum.de/review/c/secop/frappy/+/32786
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Alexander Zaft <a.zaft@fz-juelich.de>

frappy/io.py

@@ -456,7 +456,7 @@ class BytesIO(IOBase):
             if not replypat.match(reply):
                 self.closeConnection()
                 raise CommunicationFailedError(f'bad response: {reply!r}'
-                                               ' does not match {expected!r}')
+                                               f' does not match {expected!r}')
 
     @Command((BLOBType(), IntRange(0)), result=BLOBType())
     def communicate(self, request, replylen):  # pylint: disable=arguments-differ