[librsvg] paint_server.rs: Fix errors

[Federico Mena Quintero <federico src gnome org>]

commit 08cd6c8ba763cb58b486ce80d54d22454d68a17e
Author: Federico Mena Quintero <federico gnome org>
Date:   Tue Mar 21 16:54:00 2017 -0600

    paint_server.rs: Fix errors

 rust/src/paint_server.rs |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/rust/src/paint_server.rs b/rust/src/paint_server.rs
index 8554a87..dfd88d1 100644
--- a/rust/src/paint_server.rs
+++ b/rust/src/paint_server.rs
@@ -1,5 +1,6 @@
 use std::str::FromStr;
 
+use error::*;
 use parsers::ParseError;
 
 /// Defines the units to be used for scaling paint servers, per the [svg specification].
@@ -12,13 +13,13 @@ pub enum PaintServerUnits {
 }
 
 impl FromStr for PaintServerUnits {
-    type Err = ParseError;
+    type Err = AttributeError;
 
-    fn from_str (s: &str) -> Result<PaintServerUnits, ParseError> {
+    fn from_str (s: &str) -> Result<PaintServerUnits, AttributeError> {
         match s {
             "userSpaceOnUse"    => Ok (PaintServerUnits::UserSpaceOnUse),
             "objectBoundingBox" => Ok (PaintServerUnits::ObjectBoundingBox),
-            _                   => Err (ParseError::new ("expected 'userSpaceOnUse' or 'objectBoundingBox'"))
+            _                   => Err (AttributeError::Parse (ParseError::new ("expected 'userSpaceOnUse' 
or 'objectBoundingBox'")))
         }
     }
 }