[media] DaVinci-VPFE-Capture: Improve another size determination in vpfe_open()

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.
Signed-off-by: NMarkus Elfring <elfring@users.sourceforge.net>
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/davinci/vpfe_capture.c

@@ -511,7 +511,7 @@ static int vpfe_open(struct file *file)
 	}
 
 	/* Allocate memory for the file handle object */
-	fh = kmalloc(sizeof(struct vpfe_fh), GFP_KERNEL);
+	fh = kmalloc(sizeof(*fh), GFP_KERNEL);
 	if (!fh)
 		return -ENOMEM;