feat: optimize code

src/cmd_challconfig.rs

@@ -36,9 +36,15 @@ impl Command for CommandImpl {
         }
 
         let mut yubi = Yubico::new();
-        if let Ok(device) = yubi.find_yubikey() {
-            success!("Found key, Vendor ID: {:?} Product ID {:?}", device.vendor_id, device.product_id);
+        let device = match yubi.find_yubikey() {
+            Ok(device) => device,
+            Err(_) => {
+                warning!("YubiKey not found");
+                return Ok(Some(1));
+            }
+        };
 
+        success!("Found key, Vendor ID: {:?} Product ID {:?}", device.vendor_id, device.product_id);
         let config = Config::default()
             .set_vendor_id(device.vendor_id)
             .set_product_id(device.product_id)
@@ -56,10 +62,6 @@ impl Command for CommandImpl {
         } else {
             success!("Device configured");
         }
-        } else {
-            warning!("YubiKey not found");
-            return Ok(Some(1));
-        }
 
         Ok(None)
     }