new test failure with sequoia-openpgp v2.1.0

Caught by Fedora package CI ("koschei") after the upgrade to sequoia-openpgp v2.1.0 landed:

failures:
---- op_encrypt::tests::encrypt_no_wrap stdout ----
21:03:32: sequoia-octopus: TB Profile directory not found
thread 'op_encrypt::tests::encrypt_no_wrap' (3178) panicked at src/op_encrypt.rs:478:9:
assertion `left == right` failed
  left: 301989893
 right: 0
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
failures:
    op_encrypt::tests::encrypt_no_wrap

This points at this assertion

rnp_try!(rnp_op_encrypt_add_recipient(op, recipient));

which compares the return code of the function to RNP_SUCCESS (which appears to be 0). So if I'm reading this right, this function now returns an error code instead of RNP_SUCCESS when compiling the Octopus with sequoia-openpgp v2.1.0.