test/checksalt.c: Adjust return values for `CRYPT_SALT_METHOD_LEGACY`.
test/checksalt.c: Adjust return values for `CRYPT_SALT_METHOD_LEGACY`.

As the crypt_checksalt() function now indicates whether a hashing method
selected in the setting is considered to be weak, we need to adjust the
expected return values.

besser82/libxcrypt,besser82/libxcrypt,besser82/libxcrypt,besser82/libxcrypt