Avoid allocating in pre_exec closure

Author: purplesyringa

src/imageproxy.rs

@@ -279,10 +279,9 @@ impl TryFrom<ImageProxyConfig> for Command {
             let mut c = std::process::Command::new("skopeo");
             unsafe {
                 c.pre_exec(|| {
-                    rustix::process::set_parent_process_death_signal(Some(
+                    Ok(rustix::process::set_parent_process_death_signal(Some(
                         rustix::process::Signal::TERM,
-                    ))
-                    .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, e))
+                    ))?)
                 });
             }
             c