[PATCH] staging/fbtft: Fix backlight

[Sam Ravnborg]

On Sat, Oct 30, 2021 at 06:29:01PM +0200, Noralf Trønnes wrote:
> Commit b4a1ed0cd18b ("fbdev: make FB_BACKLIGHT a tristate") forgot to
> update fbtft breaking its backlight support when FB_BACKLIGHT is a module.
> 
> Fix this by using IS_ENABLED().
> 
> Fixes: b4a1ed0cd18b ("fbdev: make FB_BACKLIGHT a tristate")
> Cc: <stable at vger.kernel.org>
> Signed-off-by: Noralf Trønnes <noralf at tronnes.org>

Acked-by: Sam Ravnborg <sam at ravnborg.org>