Fix clippy warnings

Signed-off-by: Maksym Pavlenko <pavlenko.maksym@gmail.com>

Author: mxpv

hv/examples/as.rs

@@ -28,10 +28,10 @@ const GUEST_RESULT_ADDR: usize = GUEST_ADDR + RESULT_OFFSET;
 #[cfg(target_arch = "aarch64")]
 use hv::arm64::{Reg, VcpuExt};
 
-use std::sync::Arc;
-
 #[cfg(target_arch = "aarch64")]
 fn main() -> Result<(), hv::Error> {
+    use std::sync::Arc;
+
     let load_addr = unsafe {
         libc::mmap(
             std::ptr::null_mut(),

hv/src/x86/mod.rs

@@ -45,6 +45,7 @@ impl Default for VmOptions {
 #[cfg(feature = "hv_10_15")]
 #[derive(Debug)]
 pub struct Space {
+    #[allow(dead_code)] // Keep handle alive as long as `Space` exists.
     vm: Arc<Vm>,
     id: SpaceId,
 }