timer_list: Remove unused function pointer typedef

Remove the 'printf_fn_t' typedef as it is not used.
Signed-off-by: NChen Lin <chen45464546@163.com>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Cc: sboyd@kernel.org
Cc: john.stultz@linaro.org
Link: https://lkml.kernel.org/r/1526053649-24229-1-git-send-email-chen45464546@163.com

kernel/time/timer_list.c

@@ -28,8 +28,6 @@ struct timer_list_iter {
 	u64 now;
 };
 
-typedef void (*print_fn_t)(struct seq_file *m, unsigned int *classes);
-
 /*
  * This allows printing both to /proc/timer_list and
  * to the console (on SysRq-Q):