arkfb: use display information in info not in var for panning

We must not use any information in the passed var besides xoffset,
yoffset and vmode as otherwise applications might abuse it.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

drivers/video/arkfb.c

@@ -908,13 +908,14 @@ static int arkfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info
 	unsigned int offset;
 
 	/* Calculate the offset */
-	if (var->bits_per_pixel == 0) {
-		offset = (var->yoffset / 16) * (var->xres_virtual / 2) + (var->xoffset / 2);
+	if (info->var.bits_per_pixel == 0) {
+		offset = (var->yoffset / 16) * (info->var.xres_virtual / 2)
+		       + (var->xoffset / 2);
 		offset = offset >> 2;
 	} else {
 		offset = (var->yoffset * info->fix.line_length) +
-			 (var->xoffset * var->bits_per_pixel / 8);
-		offset = offset >> ((var->bits_per_pixel == 4) ? 2 : 3);
+			 (var->xoffset * info->var.bits_per_pixel / 8);
+		offset = offset >> ((info->var.bits_per_pixel == 4) ? 2 : 3);
 	}
 
 	/* Set the offset */