clippy: Fix clippy::question_mark

Fix `clippy::question_mark` warnings reported by clippy 0.1.85
(4d91de4e48 2025-02-17).

```console
error: this `match` expression can be replaced with `?`
  --> vhost-device-can/src/main.rs:77:27
   |
77 |           let can_devices = match parse_can_devices(&args) {
   |  ___________________________^
78 | |             Ok(can_devs) => can_devs,
79 | |             Err(e) => return Err(e),
80 | |         };
   | |_________^ help: try instead: `parse_can_devices(&args)?`
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#question_mark
   = note: `-D clippy::question-mark` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::question_mark)]`
```

Signed-off-by: Ruoqing He <heruoqing@iscas.ac.cn>

vhost-device-can/src/main.rs

@@ -74,10 +74,7 @@ impl TryFrom<CanArgs> for VuCanConfig {
             return Err(Self::Error::SocketCountInvalid(0));
         }
 
-        let can_devices = match parse_can_devices(&args) {
-            Ok(can_devs) => can_devs,
-            Err(e) => return Err(e),
-        };
+        let can_devices = parse_can_devices(&args)?;
 
         Ok(VuCanConfig {
             socket_path: args.socket_path,