drm/fb_helper: set info->par in fill_info()

The fbdev emulation helpers pretty much assume that this is set.
Let's do it for everyone.

Reviewed-by: Sam Ravnborg <[e-mail]>
Cc: Sam Ravnborg <[e-mail]>
Reviewed-by: Noralf Trønnes <[e-mail]>
Reviewed-by: Alex Deucher <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/drm_fb_helper.c

···
 	drm_fb_helper_fill_var(info, fb_helper,
 			       sizes->fb_width, sizes->fb_height);
 
+	info->par = fb_helper;
 	snprintf(info->fix.id, sizeof(info->fix.id), "%sdrmfb",
 		 fb_helper->dev->driver->name);
 
···
 	if (IS_ERR(fbi))
 		return PTR_ERR(fbi);
 
-	fbi->par = fb_helper;
 	fbi->fbops = &drm_fbdev_fb_ops;
 	fbi->screen_size = fb->height * fb->pitches[0];
 	fbi->fix.smem_len = fbi->screen_size;