address clippy warnings for azure_iot_deviceupdate (#1405)

Author: demoray

sdk/iot_deviceupdate/src/client.rs

@@ -110,7 +110,7 @@ impl DeviceUpdateClient {
         if resp.status() == 202u16 {
             let headers = resp.headers();
             return match headers.get("operation-location") {
-                Some(location) => location.to_str().map(|x| x.to_string()).context(
+                Some(location) => location.to_str().map(ToString::to_string).context(
                     ErrorKind::Other,
                     "invalid characters in operation-location path",
                 ),

sdk/iot_deviceupdate/src/device_update.rs

@@ -202,8 +202,7 @@ impl DeviceUpdateClient {
                     }))
                 }
                 OperationStatus::Succeeded => return Ok(update_operation),
-                OperationStatus::NotStarted => continue,
-                OperationStatus::Running => continue,
+                OperationStatus::NotStarted | OperationStatus::Running => continue,
                 OperationStatus::Undefined => {
                     return Err(Error::with_message(ErrorKind::Other, || {
                         format!(

sdk/iot_deviceupdate/src/lib.rs

@@ -17,7 +17,7 @@ mod tests {
     pub(crate) fn mock_client(server_url: String) -> crate::client::DeviceUpdateClient {
         crate::client::DeviceUpdateClient {
             device_update_url: url::Url::parse(&server_url).unwrap(),
-            endpoint: "".to_string(),
+            endpoint: String::new(),
             token_credential: AutoRefreshingTokenCredential::new(Arc::new(MockCredential)),
         }
     }