Fix `cargo test` compilation #1936

Job	Run time
Check documentation	2m 44s
Check spelling	11s
Check formatting	9s
Check Clippy lints	5m 29s
Check minimum supported rust version (MSRV)	5m 58s
Fedora tests	26s
Fedora rawhide tests	1m 53s
Ubuntu tests	3m 3s
Ubuntu tests on v4.x.y of tpm2-tss libraries found using pkg-config --target tpm2-tools	3m 18s
Valgrind test run	3m 14s
Ubuntu tests on v4.x.y of tpm2-tss libraries found using a path	3m 22s
	29m 47s

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