leds: trigger: Stop exporting trigger_list

Commit 682e98564ffb ("leds: trigger: panic: Simplify
led_trigger_set_panic") removed the last external user of variable
trigger_list. So stop exporting it. If in future a need should arise
again to access this variable, I think we better add some accessor
instead of exporting the variable directly.

Signed-off-by: Heiner Kallweit <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Lee Jones <[e-mail]>

drivers/leds/led-triggers.c

···
  * Nests outside led_cdev->trigger_lock
  */
 static DECLARE_RWSEM(triggers_list_lock);
-LIST_HEAD(trigger_list);
+static LIST_HEAD(trigger_list);
 
  /* Used by LED Class */
 

drivers/leds/leds.h

···
 
 extern struct rw_semaphore leds_list_lock;
 extern struct list_head leds_list;
-extern struct list_head trigger_list;
 extern const char * const led_colors[LED_COLOR_ID_MAX];
 
 #endif	/* __LEDS_H_INCLUDED */