[FS#1514] Kernel oops when using wireguard and nf_flow_table

[LEDE Bugs]

The following task has a new comment added:

FS#1514 - Kernel oops when using wireguard and nf_flow_table
User who did this - Zhong Jianxin (azuwis)

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Did another test, enabling `flow_offloading` is enough to crash the router:

  /etc/config/firewall
  config defaults
      option flow_offloading '1'
      option flow_offloading_hw '0'
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=1514#comment4650