Every other log in this function is debug level, so downgrade this too.
Otherwise compiling without libcryptsetup means sd-executor logs at
error level when starting any service, regardless of whether it is
needed or not.
Fixes https://github.com/systemd/systemd/issues/39968
Follow-up for
efaf5a763d6a06645dba8e88ebc15e887d59cbef
return 1;
#else
- return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "cryptsetup support is not compiled in.");
+ return log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "cryptsetup support is not compiled in.");
#endif
}