[PATCH] matroxfb dies when you try to use secondary head in 2.5.x

James introduced bad bug which causes NULL pointer dereference as soon
as you'll try to use secondary head because of screen_base is not
initialized (it is initialized on wrong head).

drivers/video/matrox/matroxfb_crtc2.c

@@ -383,7 +383,7 @@ static int matroxfb_dh_set_var(struct fb_var_screeninfo* var, int con,
 		chgvar = 0;
 	p->var = *var;
 	/* cmap */
-	ACCESS_FBINFO(fbcon.screen_base) = vaddr_va(m2info->video.vbase);
+	m2info->fbcon.screen_base = vaddr_va(m2info->video.vbase);
 	p->visual = visual;
 	p->ypanstep = 1;
 	p->ywrapstep = 0;