Added UResult for hostid

src/uu/hostid/src/hostid.rs

@@ -12,6 +12,7 @@ extern crate uucore;
 
 use clap::{crate_version, App};
 use libc::c_long;
+use uucore::error::UResult;
 
 static SYNTAX: &str = "[options]";
 
@@ -20,10 +21,11 @@ extern "C" {
     pub fn gethostid() -> c_long;
 }
 
-pub fn uumain(args: impl uucore::Args) -> i32 {
+#[uucore_procs::gen_uumain]
+pub fn uumain(args: impl uucore::Args) -> UResult<()> {
     uu_app().get_matches_from(args);
     hostid();
-    0
+    Ok(())
 }
 
 pub fn uu_app() -> App<'static, 'static> {