Make Scanner object unwind safe #684

Job	Run time
Deny	15s
Clippy	43s
Test features --no-default-features	56s
Coverage	1m 18s
Test features --no-default-features --features=hash	55s
Test features --no-default-features --features=object	59s
Rust 1.65.0	55s
Test features --no-default-features --features=process	57s
Rustfmt	7s
Test features --no-default-features --features=hash,object	59s
Test linux	2m 7s
Test features --no-default-features --features=object,authenticode	1m 3s
Test Macos 12	3m 25s
Test linux32	1m 57s
Test features --no-default-features --features=object,authenticode,authenticode-verify	1m 5s
Test windows	5m 36s
Test features --all-features	1m 7s
Test windows32	5m 33s
	29m 57s

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