better handling of get_mce_kill return value

Author: DOhlsson

src/sys/prctl.rs

@@ -211,5 +211,8 @@ pub fn get_mce_kill() -> Result<PrctlMCEKillPolicy> {
         libc::prctl(PR_MCE_KILL_GET as c_int, 0, 0, 0, 0)
     };
 
-    Errno::result(res).map(|res| PrctlMCEKillPolicy::try_from(res).unwrap())
+    match Errno::result(res) {
+        Ok(val) => Ok(PrctlMCEKillPolicy::try_from(val)?),
+        Err(e) => Err(e),
+    }
 }