video: fbdev: omapfb: lcd_ams_delta: fix unused variable warning

A recent cleanup patch removed the only reference to a local variable
in some configurations.

Move the variable into the one block it is still used in, inside
of an #ifdef, to avoid this warning.

Fixes: 9d773f10 ("video: fbdev: omapfb: lcd_ams_delta: Make use of the helper function dev_err_probe()")
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

drivers/video/fbdev/omap/lcd_ams_delta.c

@@ -128,7 +128,6 @@ static struct lcd_panel ams_delta_panel = {
 static int ams_delta_panel_probe(struct platform_device *pdev)
 {
 	struct lcd_device *lcd_device = NULL;
-	int ret;
 
 	gpiod_vblen = devm_gpiod_get(&pdev->dev, "vblen", GPIOD_OUT_LOW);
 	if (IS_ERR(gpiod_vblen))
@@ -145,7 +144,8 @@ static int ams_delta_panel_probe(struct platform_device *pdev)
 						&ams_delta_lcd_ops);
 
 	if (IS_ERR(lcd_device)) {
-		ret = PTR_ERR(lcd_device);
+		int ret = PTR_ERR(lcd_device);
+
 		dev_err(&pdev->dev, "failed to register device\n");
 		return ret;
 	}