tick/nohz: Fix inverted return value in check_tick_dependency() fast path

Commit 5653467 ("tick/nohz: Optimize check_tick_dependency() with
early return") added a fast path that returns !val when the tick_stop
tracepoint is disabled.

This is inverted: the slow path returns true when a dependency IS found
(val != 0), but !val returns true when val is zero (no dependency).  The
result is that can_stop_full_tick() sees "dependency found" when there are
none, and the tick never stops on nohz_full CPUs.

Fix this by returning !!val instead of !val, matching the slow-path semantics.

Fixes: 5653467 ("tick/nohz: Optimize check_tick_dependency() with early return")
Signed-off-by: Josh Snyder <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Assisted-by: Claude:claude-opus-4-6
Link: https://patch.msgid.link/[email protected]

Author: hashbrowncipher

kernel/time/tick-sched.c

@@ -345,7 +345,7 @@ static bool check_tick_dependency(atomic_t *dep)
 	int val = atomic_read(dep);
 
 	if (likely(!tracepoint_enabled(tick_stop)))
-		return !val;
+		return !!val;
 
 	if (val & TICK_DEP_MASK_POSIX_TIMER) {
 		trace_tick_stop(0, TICK_DEP_MASK_POSIX_TIMER);