vmm: Fix AArch64 clippy warnings of vmm and other crates

Signed-off-by: Michael Zhao <michael.zhao@arm.com>

vmm/src/cpu.rs

@@ -981,12 +981,10 @@ impl CpuManager {
 
     #[cfg(target_arch = "aarch64")]
     pub fn get_mpidrs(&self) -> Vec<u64> {
-        let vcpu_mpidrs = self
-            .vcpus
+        self.vcpus
             .iter()
             .map(|cpu| cpu.lock().unwrap().get_mpidr())
-            .collect();
-        vcpu_mpidrs
+            .collect()
     }
 
     #[cfg(feature = "acpi")]

vmm/src/device_manager.rs

@@ -1356,7 +1356,7 @@ impl DeviceManager {
 
         self.address_manager
             .mmio_bus
-            .insert(rtc_device.clone(), addr.0, MMIO_LEN)
+            .insert(rtc_device, addr.0, MMIO_LEN)
             .map_err(DeviceManagerError::BusError)?;
 
         self.id_to_dev_info.insert(

vmm/src/memory_manager.rs

@@ -604,6 +604,7 @@ impl MemoryManager {
     // If the next area is hotplugged RAM, the start address needs to be aligned
     // to 128MiB boundary, and a gap of 256MiB need to be set before it.
     // On x86_64, it must also start at the 64bit start.
+    #[allow(clippy::let_and_return)]
     fn start_addr(mem_end: GuestAddress, with_gap: bool) -> GuestAddress {
         let start_addr = if with_gap {
             GuestAddress((mem_end.0 + 1 + (256 << 20)) & !((128 << 20) - 1))

vmm/src/vm.rs

@@ -401,7 +401,7 @@ impl Vm {
         #[cfg(target_arch = "x86_64")]
         vm.enable_split_irq().unwrap();
         let vm_snapshot = get_vm_snapshot(snapshot).map_err(Error::Restore)?;
-        let config = vm_snapshot.config.clone();
+        let config = vm_snapshot.config;
         if let Some(state) = vm_snapshot.state {
             vm.set_state(&state)
                 .map_err(|e| Error::Restore(MigratableError::Restore(e.into())))?;
@@ -1576,7 +1576,7 @@ mod tests {
             &CString::new("console=tty0").unwrap(),
             vec![0],
             &dev_info,
-            &gic,
+            &*gic,
             &None,
             &None,
         )