xso-proc: clippy run

Caught a bug hidden behind #[cfg(not(feature = "minidom"))]

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

xso-proc/src/error_message.rs

@@ -130,7 +130,7 @@ pub(super) fn on_missing_attribute(parent_name: &ParentRef, field: &Member) -> S
 /// `parent_name` should point at the compound which is being parsed and
 /// `field` should be the field to which the child belongs.
 pub(super) fn on_missing_child(parent_name: &ParentRef, field: &Member) -> String {
-    format!("Missing child {} in {}.", FieldName(&field), parent_name)
+    format!("Missing child {} in {}.", FieldName(field), parent_name)
 }
 
 /// Create a string error message for a duplicate child element.
@@ -141,6 +141,6 @@ pub(super) fn on_duplicate_child(parent_name: &ParentRef, field: &Member) -> Str
     format!(
         "{} must not have more than one child in {}.",
         parent_name,
-        FieldName(&field)
+        FieldName(field)
     )
 }