sched: Remove unneeded function type cast in do_balance_callbacks()

It's a trivial and non-functional change, the removed explicit function
type cast does not convert the function type of struct balance_callback
member (*func), and the cast can be removed.

Signed-off-by: Vladimir Zapolskiy <vz@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260819080159.105433-1-vz@kernel.org

kernel/sched/core.c

@@ -5143,7 +5143,7 @@ static void do_balance_callbacks(struct rq *rq, struct balance_callback *head)
 	lockdep_assert_rq_held(rq);
 
 	while (head) {
-		func = (void (*)(struct rq *))head->func;
+		func = head->func;
 		next = head->next;
 		head->next = NULL;
 		head = next;