fscrypt: require that fscrypt_encrypt_symlink() already has key

Now that all filesystems have been converted to use
fscrypt_prepare_new_inode(), the encryption key for new symlink inodes
is now already set up whenever we try to encrypt the symlink target.
Enforce this rather than try to set up the key again when it may be too
late to do so safely.

Acked-by: Jeff Layton <jlayton@kernel.org>
Link: https://lore.kernel.org/r/20200917041136.178600-9-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>

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