posix-timers: Rename do_schedule_next_timer

That function is a misnomer. Rename it with a proper prefix to
posixtimer_rearm().

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: John Stultz <john.stultz@linaro.org>
Link: http://lkml.kernel.org/r/20170530211656.811362578@linutronix.de

diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index 8f9cca3..771e5f7 100644
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -112,6 +112,6 @@ long clock_nanosleep_restart(struct restart_block *restart_block);
 
 void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new);
 
-void do_schedule_next_timer(struct siginfo *info);
+void posixtimer_rearm(struct siginfo *info);
 
 #endif