If your code had actually broken with the change to a zero (for example it didn't just report 0 of some resource in use in the log, but spawned an unlimited amo

If your code had actually broken with the change to a zero (for example it didn't just report 0 of some resource in use in the log, but spawned an unlimited amount of threads until it crashed or something) then you could have reported it as a kernel regression, and it would have been fixed in another way.