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 <[e-mail]>
Cc: Julia Lawall <[e-mail]>
Cc: Antonino Daplas <[e-mail]>
Signed-off-by: Bartlomiej Zolnierkiewicz <[e-mail]>

drivers/video/fbdev/matrox/matroxfb_base.c

···
 	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,