Possible memory leakage in function `Emitter::emit`

[rikkaii]

Hi, I'm conducting a research on Rust security and found a bug in this crate:
The raw pointer emit is not freed after use, and utils::to_str function also does not take ownership of this pointer, which may cause a memory leak.

libucl-rs/libucl/src/object/emitter.rs

Lines 18 to 19 in 30360ec

	let emit = unsafe { ucl_object_emit(obj.as_ref().obj, Into::into(*self)) };
	utils::to_str(emit)