save correct hook to prev_shmem_startup_hook for PostgreSQL 15

Author: okbob

src/plpgsql_check.c

@@ -93,8 +93,11 @@ void			_PG_fini(void);
 #endif
 
 #if PG_VERSION_NUM >= 150000
+
 shmem_request_hook_type prev_shmem_request_hook = NULL;
+
 #endif
+
 shmem_startup_hook_type prev_shmem_startup_hook = NULL;
 
 bool plpgsql_check_regress_test_mode;
@@ -327,7 +330,7 @@ _PG_init(void)
 		 */
 #if PG_VERSION_NUM >= 150000
 
-		prev_shmem_startup_hook = shmem_request_hook;
+		prev_shmem_startup_hook = shmem_startup_hook;
 		shmem_request_hook = plpgsql_check_profiler_shmem_request;
 
 #endif
@@ -354,7 +357,9 @@ void
 _PG_fini(void)
 {
 #if PG_VERSION_NUM >= 150000
+
 	shmem_request_hook = prev_shmem_request_hook;
+
 #endif
 	shmem_startup_hook = prev_shmem_startup_hook;