Fix builds with CONFIG_PMAC_BACKLIGHT=y. The include statement for the
backlight header has recently been removed from <linux/fb.h>. Add it to
via-pmu-backlight.c to get the necessary symbols.

Reported-by: Naresh Kamboju <redacted>
Closes: https://lore.kernel.org/dri-devel/CA+G9fYsAk5TbqqxFC2W4oHLGA0CbTHMxbeq8QayFXTU75YiueA@mail.gmail.com/ (local)
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Fixes: 11b4eedfc87d ("fbdev: Do not include <linux/backlight.h> in header")
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Jani Nikula <redacted>
Cc: Helge Deller <deller@gmx.de>
Cc: linux-fbdev@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
---
 drivers/macintosh/via-pmu-backlight.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/macintosh/via-pmu-backlight.c b/drivers/macintosh/via-pmu-backlight.c
index c2d87e7fa85be..89450645c2305 100644
--- a/drivers/macintosh/via-pmu-backlight.c
+++ b/drivers/macintosh/via-pmu-backlight.c

@@ -10,6 +10,7 @@
 
 #include <asm/ptrace.h>
 #include <linux/adb.h>
+#include <linux/backlight.h>
 #include <linux/pmu.h>
 #include <asm/backlight.h>
 

-- 
2.44.0