tty/serial: atmel: remove redundant assignment to ret

Variable ret is initialized to a value that is never read and it
is re-assigned later. The initialization is redundant and can be
removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20190809174042.6276-1-colin.king@canonical.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/atmel_serial.c

@@ -2888,7 +2888,7 @@ static int atmel_serial_probe(struct platform_device *pdev)
 	struct atmel_uart_port *atmel_port;
 	struct device_node *np = pdev->dev.parent->of_node;
 	void *data;
-	int ret = -ENODEV;
+	int ret;
 	bool rs485_enabled;
 
 	BUILD_BUG_ON(ATMEL_SERIAL_RINGSIZE & (ATMEL_SERIAL_RINGSIZE - 1));