PR10912 backport https://github.com/bitcoin/bitcoin/pull/10912/files
065039d [tests] Fix incorrect memory_cleanse(…) call in crypto_tests.cpp (practicalswift)
Pull request description:
`chKey` and `chIV` are pointers, not arrays :-) Probably the result of copy-pasting of old code where the code was operating on arrays instead of pointers. If I'm reading the code correctly the absence/presence of these `memory_cleanse(…)` calls won't alter the outcome of the test in question (`TestPassphraseSingle`) even if fixed. Therefore removing.