video: au1100fb: Improve a size determination in au1100fb_drv_probe()

Replace the specification of a data structure by a pointer dereference
as the parameter for the operator "sizeof" to make the corresponding size
determination a bit safer according to the Linux coding style convention.

This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

drivers/video/fbdev/au1100fb.c

@@ -416,8 +416,7 @@ static int au1100fb_drv_probe(struct platform_device *dev)
 	struct clk *c;
 
 	/* Allocate new device private */
-	fbdev = devm_kzalloc(&dev->dev, sizeof(struct au1100fb_device),
-			     GFP_KERNEL);
+	fbdev = devm_kzalloc(&dev->dev, sizeof(*fbdev), GFP_KERNEL);
 	if (!fbdev)
 		return -ENOMEM;