fbdev: matrox: make fb_ops const

Make fb_ops const as it is only used during a copy operation.
Done using Coccinelle.
Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Cc: Julia Lawall <Julia.Lawall@lip6.fr>
Cc: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

drivers/video/fbdev/matrox/matroxfb_base.c

@@ -1198,7 +1198,7 @@ static int matroxfb_blank(int blank, struct fb_info *info)
 	return 0;
 }
 
-static struct fb_ops matroxfb_ops = {
+static const struct fb_ops matroxfb_ops = {
 	.owner =	THIS_MODULE,
 	.fb_open =	matroxfb_open,
 	.fb_release =	matroxfb_release,