This also fixes a bug where the set-passphrase
command failed to derive the key for disks initially
formatted with --encrypted and --no_passphrase, due to
bch_sb_crypt_init not configuring the KDF params if
the passphrase wasn't specified during formatting.
Signed-off-by: Mae Kasza <git@badat.dev>
Tested-by: Jérôme Poulin <jeromepoulin@gmail.com>