NJS: adding the missing vm destruction.

This commit fixed the njs memory leak happened in the config validation, updating and http requests.

src/nxt_router.c

@@ -1111,6 +1111,10 @@ temp_fail:
 
 fail:
 
+    if (rtcf->tstr_state != NULL) {
+        nxt_tstr_state_release(rtcf->tstr_state);
+    }
+
     nxt_mp_destroy(mp);
 
     return NULL;
@@ -3794,6 +3798,8 @@ nxt_router_conf_release(nxt_task_t *task, nxt_socket_conf_joint_t *joint)
 
         nxt_router_access_log_release(task, lock, rtcf->access_log);
 
+        nxt_tstr_state_release(rtcf->tstr_state);
+
         nxt_mp_thread_adopt(rtcf->mem_pool);
 
         nxt_mp_destroy(rtcf->mem_pool);