Somebody already thought of that and propposed a solution. If the output is identical after the codechanges you are safe.
Hmmm, unless the backdoor is only active if you enable a non-default setting. It would be quite nasty to only enable it when the "Fast routing" or "Netfilter NAT" option are enabled. This way it's hard to spot and will be enabled on most firewalls.
So this should be tested with allyesconfig or something similar...
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