hrtimer: Fix softirq base check in update_needs_ipi()

The 'clockid' field is not the correct way to check for a softirq base.

Fix the check to correctly compare the base type instead of the clockid.

Fixes: 1e7f7fb ("hrtimer: Avoid more SMP function calls in clock_was_set()")
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260107-hrtimer-clock-base-check-v1-1-afb5dbce94a1@linutronix.de

Author: t-8ch

kernel/time/hrtimer.c

@@ -913,7 +913,7 @@ static bool update_needs_ipi(struct hrtimer_cpu_base *cpu_base,
 			return true;
 
 		/* Extra check for softirq clock bases */
-		if (base->clockid < HRTIMER_BASE_MONOTONIC_SOFT)
+		if (base->index < HRTIMER_BASE_MONOTONIC_SOFT)
 			continue;
 		if (cpu_base->softirq_activated)
 			continue;