[S390] time: let local_tick_enable/disable() reprogram the clock comparator

Let local_tick_enable/disable() reprogram the clock comparator so the
function names make semantically more sense.
Also that way the functions are more symmetric since normally each
local_tick_enable() call usually would have a subsequent call to
set_clock_comparator() anyway.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/include/asm/timex.h b/arch/s390/include/asm/timex.h
index 335afc0..88829a4 100644
--- a/arch/s390/include/asm/timex.h
+++ b/arch/s390/include/asm/timex.h
@@ -59,12 +59,14 @@
 
 	old = S390_lowcore.clock_comparator;
 	S390_lowcore.clock_comparator = -1ULL;
+	set_clock_comparator(S390_lowcore.clock_comparator);
 	return old;
 }
 
 static inline void local_tick_enable(unsigned long long comp)
 {
 	S390_lowcore.clock_comparator = comp;
+	set_clock_comparator(S390_lowcore.clock_comparator);
 }
 
 #define CLOCK_TICK_RATE	1193180 /* Underlying HZ */