Change Details

`make check` I ran Asan on `./src/test/test_bitcoin --run_test=key_tests` with and without this patch. Prior to patch it threw error "WRITE of size 32"; afterwards it has no errors.

`make check` I ran ASan-compiled `./src/test/test_bitcoin --run_test=key_tests` with and without this patch. Prior to patch it threw error "WRITE of size 32"; afterwards it has no errors.

`make check` I ran Asan on `San-compiled `./src/test/test_bitcoin --run_test=key_tests` with and without this patch. Prior to patch it threw error "WRITE of size 32"; afterwards it has no errors.