misc: Fix clippy issues

Signed-off-by: Bo Chen <chen.bo@intel.com>

hypervisor/src/arch/x86/emulator/instructions/mod.rs

@@ -56,7 +56,7 @@ fn get_op<T: CpuStateManager>(
         OpKind::Immediate16 => insn.immediate16() as u64,
         OpKind::Immediate32 => insn.immediate32() as u64,
         OpKind::Immediate32to64 => insn.immediate32to64() as u64,
-        OpKind::Immediate64 => insn.immediate64() as u64,
+        OpKind::Immediate64 => insn.immediate64(),
         k => return Err(PlatformError::InvalidOperand(anyhow!("{:?}", k))),
     };
 

hypervisor/src/mshv/mod.rs

@@ -1093,7 +1093,7 @@ impl vm::Vm for MshvVm {
             flags,
             guest_pfn: guest_phys_addr >> PAGE_SHIFT,
             size: memory_size,
-            userspace_addr: userspace_addr as u64,
+            userspace_addr,
         }
         .into()
     }