[Mellanox] Fix reboot script usage in mlnx-onie-fw-update (#18863)

/usr/local/bin/reboot could return execution back to the invoking script in case of using graceful reboot. So, exit the script with reboot return code instead of proceeding with execution.

- Why I did it
Fix BIOS fw update procedure.

- How I did it
Return exit code from reboot script in mlnx-onie-fw-update.sh

- How to verify it
Tested with successful reboot
Tested with unsuccessful reboot

Signed-off-by: Stepan Blyschak <[email protected]>

Author: stepanblyschak

platform/mellanox/mlnx-onie-fw-update.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 #
-# Copyright (c) 2020-2022 NVIDIA CORPORATION & AFFILIATES.
+# Copyright (c) 2020-2024 NVIDIA CORPORATION & AFFILIATES.
 # Apache-2.0
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -107,6 +107,7 @@ system_reboot() {
 
     # Use SONiC reboot scenario
     /usr/local/bin/reboot
+    exit $?
 }
 
 terminate_handler() {