dm: serial: fix console putc

Commit b8893327e9 (dm: serial: Put common code into separate functions)
consolidated getc() correctly, but introduced another bug to putc();
serial_stub_putc() passes sdev->priv to serial_putc_dev(), but
serial_putc_dev() uses cur_dev instead of the given argument.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Acked-by: Simon Glass <sjg@chromium.org>

drivers/serial/serial-uclass.c

@@ -85,14 +85,14 @@ void serial_initialize(void)
 
 static void serial_putc_dev(struct udevice *dev, char ch)
 {
-	struct dm_serial_ops *ops = serial_get_ops(cur_dev);
+	struct dm_serial_ops *ops = serial_get_ops(dev);
 	int err;
 
 	do {
-		err = ops->putc(cur_dev, ch);
+		err = ops->putc(dev, ch);
 	} while (err == -EAGAIN);
 	if (ch == '\n')
-		serial_putc('\r');
+		serial_putc_dev(dev, '\r');
 }
 
 void serial_putc(char ch)