cleanup elf loader and more work towards boot support

xencall/examples/domain_create.rs

@@ -5,7 +5,7 @@ use xencall::{XenCall, XenCallError};
 fn main() -> Result<(), XenCallError> {
     let call = XenCall::open()?;
     let domctl: DomainControl = DomainControl::new(&call);
-    let info = domctl.create_domain(CreateDomain::default())?;
-    println!("created domain {}", info.domid);
+    let domid = domctl.create_domain(CreateDomain::default())?;
+    println!("created domain {}", domid);
     Ok(())
 }