posix-timers: Cleanup the flag/flags confusion

do_timer_settime() has a 'flags' argument and uses 'flag' for the interrupt
flags, which is confusing at best.

Rename the argument so 'flags' can be used for interrupt flags as usual.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20190730223828.782664411@linutronix.de

kernel/time/posix-timers.c

@@ -844,13 +844,13 @@ int common_timer_set(struct k_itimer *timr, int flags,
 	return 0;
 }
 
-static int do_timer_settime(timer_t timer_id, int flags,
+static int do_timer_settime(timer_t timer_id, int tmr_flags,
 			    struct itimerspec64 *new_spec64,
 			    struct itimerspec64 *old_spec64)
 {
 	const struct k_clock *kc;
 	struct k_itimer *timr;
-	unsigned long flag;
+	unsigned long flags;
 	int error = 0;
 
 	if (!timespec64_valid(&new_spec64->it_interval) ||
@@ -860,7 +860,7 @@ static int do_timer_settime(timer_t timer_id, int flags,
 	if (old_spec64)
 		memset(old_spec64, 0, sizeof(*old_spec64));
 retry:
-	timr = lock_timer(timer_id, &flag);
+	timr = lock_timer(timer_id, &flags);
 	if (!timr)
 		return -EINVAL;
 
@@ -868,9 +868,9 @@ static int do_timer_settime(timer_t timer_id, int flags,
 	if (WARN_ON_ONCE(!kc || !kc->timer_set))
 		error = -EINVAL;
 	else
-		error = kc->timer_set(timr, flags, new_spec64, old_spec64);
+		error = kc->timer_set(timr, tmr_flags, new_spec64, old_spec64);
 
-	unlock_timer(timr, flag);
+	unlock_timer(timr, flags);
 	if (error == TIMER_RETRY) {
 		old_spec64 = NULL;	// We already got the old time...
 		goto retry;