Add warning instead of failing silently

Log a warning when a VCI_E_ACCESSDENIED error is returned from a driver function call.

Author: MattWoodhead

can/interfaces/ixxat/canlib.py

@@ -126,7 +126,8 @@ def __check_status(result: int, function: Callable, args: Tuple):
     elif result == constants.VCI_E_NO_MORE_ITEMS:
         raise StopIteration()
     elif result == constants.VCI_E_ACCESSDENIED:
-        pass  # not a real error, might happen if another program has initialized the bus
+        log.warning(f"VCI_E_ACCESSDENIED error raised when calling VCI Function {function._name}")
+        # not a real error, might happen if another program has initialized the bus
     elif result != constants.VCI_OK:
         raise VCIError(vciFormatError(function, result))