ixxat: Fix exception in 'state' property on bus coupling errors (hardbyte#1647)

BusState is not an exception type and should be raised (especially not in a property).

Author: henzef

can/interfaces/ixxat/canlib_vcinpl.py

@@ -852,7 +852,7 @@ def state(self) -> BusState:
         error_byte_2 = status.dwStatus & 0xF0
         # CAN_STATUS_BUSCERR  = 0x20  # bus coupling error
         if error_byte_2 & constants.CAN_STATUS_BUSCERR:
-            raise BusState.ERROR
+            return BusState.ERROR
 
         return BusState.ACTIVE