fix: ensure wasm result buffer is always deallocated

[Ocheretovich]

No description provided.

[cdump]

Could you please explain this change?
You replaced dealloc with deferred dealloc, but the return statement is literally on the next line, so we just added the cost of defer without any benefit

[Ocheretovich]

I changed it to defer to make sure the buffer is always deallocated even if an early return is added later. But I agree it doesn’t bring a benefit in the current flow I can revert it.

[cdump]

Let's skip this - the function is quite small, and even if an early return is added in the future, the chance of missing that deallocation is very small