serial: sprd: remove redundant sprd_port cleanup

We don't need to cleanup sprd_port anymore, since we've dropped the way
of using the sprd_port[] array to get port index.

Reviewed-by: Baolin Wang <[e-mail]>
Signed-off-by: Chunyan Zhang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/serial/sprd_serial.c

···
 	sprd_ports_num++;
 
 	ret = uart_add_one_port(&sprd_uart_driver, up);
-	if (ret) {
-		sprd_port[index] = NULL;
+	if (ret)
 		sprd_remove(pdev);
-	}
 
 	platform_set_drvdata(pdev, up);