list_provider_info(): Fix leak on error

Fixes #24110

Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
Reviewed-by: Paul Dale <ppzgs1@gmail.com>
(Merged from #24117)

(cherry picked from commit 993c240)

apps/list.c

@@ -1230,6 +1230,7 @@ static void list_provider_info(void)
     }
 
     if (OSSL_PROVIDER_do_all(NULL, &collect_providers, providers) != 1) {
+        sk_OSSL_PROVIDER_free(providers);
         BIO_printf(bio_err, "ERROR: Memory allocation\n");
         return;
     }