Fix Guard for variable release

ge/graph/load/model_manager/model_manager.cc

@@ -1394,9 +1394,19 @@ Status ModelManager::LaunchKernelCustAicpuSo(const string &kernel_name) {
     return SUCCESS;
   }
 
+  rtStream_t stream = nullptr;
   vector<void *> allocated_mem;
+  std::function<void()> callback = [&]() {
+    for (auto mem : allocated_mem) {
+      GE_CHK_RT(rtFree(mem));
+    }
+    if (stream != nullptr) {
+      GE_CHK_RT(rtStreamDestroy(stream));
+    }
+  };
+  GE_MAKE_GUARD(release, callback);
+
   rtError_t status;
-  rtStream_t stream = nullptr;
   vector<CustAicpuSoBuf> v_cust_so;
   void *args = nullptr;
 
@@ -1471,13 +1481,6 @@ Status ModelManager::LaunchKernelCustAicpuSo(const string &kernel_name) {
     GELOGE(RT_FAILED, "[Call][RtStreamSynchronize] fail, ret = 0x%X", status);
     return RT_ERROR_TO_GE_STATUS(status);
   }
-  std::function<void()> callback = [&]() {
-    for (auto mem : allocated_mem) {
-      GE_CHK_RT(rtFree(mem));
-    }
-    GE_CHK_RT(rtStreamDestroy(stream));
-  };
-  GE_MAKE_GUARD(release, callback);
   GELOGI("Cpu kernel launch task success.");
   return SUCCESS;
 }