compute_pqueue_growth(): Fix the return type

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Hugo Landau <hlandau@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/20012)

ssl/priority_queue.c

@@ -85,7 +85,7 @@ static const size_t max_nodes =
  *
  * We use an expansion factor of 8 / 5 = 1.6
  */
-static ossl_inline int compute_pqueue_growth(size_t target, size_t current)
+static ossl_inline size_t compute_pqueue_growth(size_t target, size_t current)
 {
     int err = 0;