ITS#8844 use getpid() in mdb_env_close0()

libraries/liblmdb/mdb.c

@@ -5997,7 +5997,7 @@ mdb_env_close_active(MDB_env *env, int excl)
 	if (env->me_fd != INVALID_HANDLE_VALUE)
 		(void) close(env->me_fd);
 	if (env->me_txns) {
-		MDB_PID_T pid = env->me_pid;
+		MDB_PID_T pid = getpid();
 		/* Clearing readers is done in this function because
 		 * me_txkey with its destructor must be disabled first.
 		 *