[librsvg] error.rs: Remove unused argument

[Federico Mena Quintero <federico src gnome org>]

commit d2e4e1fde4debb6c5ed577322df7e218e906f916
Author: Federico Mena Quintero <federico gnome org>
Date:   Wed Mar 15 21:39:42 2017 -0600

    error.rs: Remove unused argument

 rust/src/error.rs |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/rust/src/error.rs b/rust/src/error.rs
index 4df39d7..f8fc632 100644
--- a/rust/src/error.rs
+++ b/rust/src/error.rs
@@ -37,7 +37,7 @@ impl NodeError {
 impl error::Error for NodeError {
     fn description (&self) -> &str {
         match self.err {
-            AttributeError::Parse (ref n) => &"parse error",
+            AttributeError::Parse (_) => &"parse error",
             AttributeError::Value (_) => &"invalid attribute value"
         }
     }