clippy fix

Author: gordonwang0

identity/aziot-identityd/src/lib.rs

@@ -907,9 +907,11 @@ fn get_cert_expiration(cert: &str) -> Result<String, Error> {
         .diff(cert.not_after())
         .map_err(|err| Error::Internal(InternalError::CreateCertificate(Box::new(err))))?;
     let diff = i64::from(diff.secs) + i64::from(diff.days) * 86400;
-    let expiration = chrono::NaiveDateTime::from_timestamp_opt(diff, 0).ok_or(Error::Internal(
-        InternalError::CreateCertificate("failed to convert timestamp".into()),
-    ))?;
+    let expiration = chrono::NaiveDateTime::from_timestamp_opt(diff, 0).ok_or_else(|| {
+        Error::Internal(InternalError::CreateCertificate(
+            "failed to convert timestamp".into(),
+        ))
+    })?;
     let expiration =
         chrono::DateTime::<chrono::Utc>::from_utc(expiration, chrono::Utc).to_rfc3339();