fix(clippy): fix clippy error

Fixes: #5030

Signed-off-by: Yushuo <y-shuo@linux.alibaba.com>
Signed-off-by: Ji-Xinyou <jerryji0414@outlook.com>

src/runtime-rs/crates/hypervisor/src/ch/inner_hypervisor.rs

@@ -494,6 +494,10 @@ impl CloudHypervisorInner {
         Ok(())
     }
 
+    pub(crate) async fn resize_vcpu(&self, old_vcpu: u32, new_vcpu: u32) -> Result<(u32, u32)> {
+        Ok((old_vcpu, new_vcpu))
+    }
+
     pub(crate) async fn get_pids(&self) -> Result<Vec<u32>> {
         Ok(Vec::<u32>::new())
     }

src/runtime-rs/crates/hypervisor/src/ch/mod.rs

@@ -114,6 +114,11 @@ impl Hypervisor for CloudHypervisor {
         inner.cleanup().await
     }
 
+    async fn resize_vcpu(&self, old_vcpu: u32, new_vcpu: u32) -> Result<(u32, u32)> {
+        let inner = self.inner.read().await;
+        inner.resize_vcpu(old_vcpu, new_vcpu).await
+    }
+
     async fn get_pids(&self) -> Result<Vec<u32>> {
         let inner = self.inner.read().await;
         inner.get_pids().await

src/runtime-rs/crates/hypervisor/src/dragonball/inner.rs

@@ -331,7 +331,7 @@ impl DragonballInner {
     // the error in this function is not ok to be tolerated, the container boot will fail
     fn precheck_resize_vcpus(&self, old_vcpus: u32, new_vcpus: u32) -> Result<(u32, u32)> {
         // old_vcpus > 0, safe for conversion
-        let current_vcpus = old_vcpus as u32;
+        let current_vcpus = old_vcpus;
 
         // a non-zero positive is required
         if new_vcpus == 0 {

src/runtime-rs/crates/resource/src/cgroups/mod.rs

@@ -173,7 +173,7 @@ impl CgroupsResource {
                     }
                     ResourceUpdateOp::Update | ResourceUpdateOp::Del => {
                         if let Some(old_resource) = old_resources {
-                            resources.insert(cid.to_owned(), old_resource.clone());
+                            resources.insert(cid.to_owned(), old_resource);
                         }
                     }
                 }