posix-timers: Refer properly to CONFIG_HIGH_RES_TIMERS

Commit c78f261e5dcb ("posix-timers: Clarify posix_timer_fn() comments")
turns an ifdef CONFIG_HIGH_RES_TIMERS into an conditional on
"IS_ENABLED(CONFIG_HIGHRES_TIMERS)"; note that the new conditional refers
to "HIGHRES_TIMERS" not "HIGH_RES_TIMERS" as before.

Fix this typo introduced in that refactoring.

Fixes: c78f261e5dcb ("posix-timers: Clarify posix_timer_fn() comments")
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230609094643.26253-1-lukas.bulwahn@gmail.com

kernel/time/posix-timers.c

@@ -356,7 +356,7 @@ static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer)
 			 * enabled as the periodic tick based timers are
 			 * automatically aligned to the next tick.
 			 */
-			if (IS_ENABLED(CONFIG_HIGHRES_TIMERS)) {
+			if (IS_ENABLED(CONFIG_HIGH_RES_TIMERS)) {
 				ktime_t kj = TICK_NSEC;
 
 				if (timr->it_interval < kj)