* The `ZSubscription_t` struct uses non-const pointers, but we aren't doing anything with them really, so just cast the things we're inserting.
* The removed `zephyr` variable already exists higher up in the function.
Testing Done:
Compile
Reviewed at https://reviews.imfreedom.org/r/457/
PidginandFinch:ThePimpin' Penguin IM Clients That'reGoodfortheSoul
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