video: fbdev: Fix format string mismatch in gbefb.c

Fix format string mismatch in gbefb_show_memsize().
Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/fbdev/gbefb.c

@@ -1068,7 +1068,7 @@ static struct fb_ops gbefb_ops = {
 
 static ssize_t gbefb_show_memsize(struct device *dev, struct device_attribute *attr, char *buf)
 {
-	return snprintf(buf, PAGE_SIZE, "%d\n", gbe_mem_size);
+	return snprintf(buf, PAGE_SIZE, "%u\n", gbe_mem_size);
 }
 
 static DEVICE_ATTR(size, S_IRUGO, gbefb_show_memsize, NULL);