drm/panel: panel-innolux: drop unused variable

The num_supplies variable is not used, delete it.
Build tested.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20190526180532.1641-2-sam@ravnborg.org

drivers/gpu/drm/panel/panel-innolux-p079zca.c

@@ -55,7 +55,6 @@ struct innolux_panel {
 
 	struct backlight_device *backlight;
 	struct regulator_bulk_data *supplies;
-	unsigned int num_supplies;
 	struct gpio_desc *enable_gpio;
 
 	bool prepared;