hecubafb: use fb_sys_read()

Since hecubafb's framebuffer is vmalloc'ed, use fb_sys_read().

Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/video/hecubafb.c b/drivers/video/hecubafb.c
index 3ec0e97..abfcb50 100644
--- a/drivers/video/hecubafb.c
+++ b/drivers/video/hecubafb.c
@@ -309,6 +309,7 @@
 
 static struct fb_ops hecubafb_ops = {
 	.owner		= THIS_MODULE,
+	.fb_read        = fb_sys_read,
 	.fb_write	= hecubafb_write,
 	.fb_fillrect	= hecubafb_fillrect,
 	.fb_copyarea	= hecubafb_copyarea,