Refactor: Simplify error mappings and standardize formatting

- Adjust YAML/JSON error mapping for improved readability.
- Fix minor indentation issue in seccomp configuration.
- Maintain consistent formatting across affected files (`vmm/mod.rs` and `spec.rs`).

Author: dpsoft

src/spec.rs

@@ -178,13 +178,11 @@ pub fn load_spec(path: &Path) -> Result<RunSpec> {
         .unwrap_or(false);
 
     let spec: RunSpec = if is_yaml {
-        serde_yaml::from_str(&raw).map_err(|e| {
-            Error::Config(format!("invalid YAML spec {}: {}", path.display(), e))
-        })?
+        serde_yaml::from_str(&raw)
+            .map_err(|e| Error::Config(format!("invalid YAML spec {}: {}", path.display(), e)))?
     } else {
-        serde_json::from_str(&raw).map_err(|e| {
-            Error::Config(format!("invalid JSON spec {}: {}", path.display(), e))
-        })?
+        serde_json::from_str(&raw)
+            .map_err(|e| Error::Config(format!("invalid JSON spec {}: {}", path.display(), e)))?
     };
 
     validate_spec(&spec)?;

src/vmm/mod.rs

@@ -763,7 +763,7 @@ fn install_seccomp_filter() -> Result<()> {
     let filter = SeccompFilter::new(
         rules,
         SeccompAction::KillThread, // Default: kill thread (not process) for unlisted syscalls
-        SeccompAction::Allow,       // Matched rules: allow
+        SeccompAction::Allow,      // Matched rules: allow
         std::env::consts::ARCH
             .try_into()
             .map_err(|_| Error::Config("Unsupported architecture for seccomp".into()))?,