Fix warning about unused_must_use for Box::from_raw #860
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rust-lang/rust#99270 recently added a
must_useforBox::from_raw. This causes this particular line to raise a warning. This solves it by explicitly dropping the value. This code was storing a pointer to a Rust structure usingBox::into_raw. This drop impl was reconstituting it as a Box in order to free the memory. However, this doesn't care about the return value as it is only doing this to then immediately drop and free the value.