can: bittiming: can_calc_bittiming(): convert from netdev_err() to NL_SET_ERR_MSG_FMT()

Replace the netdev_err() by NL_SET_ERR_MSG_FMT() to better inform the
user about the problem. While there, use %u to print unsigned values
and improve error message a bit.

In case of an error, return -EINVAL instead of -EDOM, this corresponds
better to the actual meaning of the error value.

Link: https://lore.kernel.org/all/20230202110854.2318594-17-mkl@pengutronix.deSigned-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/dev/calc_bittiming.c

@@ -134,12 +134,13 @@ int can_calc_bittiming(const struct net_device *dev, struct can_bittiming *bt,
 		do_div(v64, bt->bitrate);
 		bitrate_error = (u32)v64;
 		if (bitrate_error > CAN_CALC_MAX_ERROR) {
-			netdev_err(dev,
-				   "bitrate error %d.%d%% too high\n",
+			NL_SET_ERR_MSG_FMT(extack,
+					   "bitrate error: %u.%u%% too high",
 					   bitrate_error / 10, bitrate_error % 10);
-			return -EDOM;
+			return -EINVAL;
 		}
-		netdev_warn(dev, "bitrate error %d.%d%%\n",
+		NL_SET_ERR_MSG_FMT(extack,
+				   "bitrate error: %u.%u%%",
 				   bitrate_error / 10, bitrate_error % 10);
 	}