It's just really strange to me that this does anything, because in the logic
above in `vdev_raidz_reconstruct_q` we're doing this:
uint64_t size = (c == x) ? 0 : MIN(rm->rm_col[x].rc_size,
rm->rm_col[c].rc_size);
As a result I think the `size` we pass to `abd_copy` in that case is 0, which
means that we'll never actually call `memcopy` (because in `abd_iterate_func2`
the callback logic is wrapped with `while (size > 0)`).
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