Fix a stupid copy/paste syntax error.

src/data_forms.rs

@@ -53,7 +53,7 @@ pub struct DataForm {
 
 pub fn parse_data_form(root: &Element) -> Result<DataForm, Error> {
     if !root.is("x", DATA_FORMS_NS) {
-        return Err(Error::ParseError("This is not a data form element.")),
+        return Err(Error::ParseError("This is not a data form element."));
     }
 
     let type_: DataFormType = match root.attr("type") {

src/disco.rs

@@ -30,7 +30,7 @@ pub struct Disco {
 
 pub fn parse_disco(root: &Element) -> Result<Disco, Error> {
     if !root.is("query", DISCO_INFO_NS) {
-        return Err(Error::ParseError("This is not a disco#info element.")),
+        return Err(Error::ParseError("This is not a disco#info element."));
     }
 
     let mut identities: Vec<Identity> = vec!();

src/jingle.rs

@@ -210,7 +210,7 @@ pub struct Jingle {
 
 pub fn parse_jingle(root: &Element) -> Result<Jingle, Error> {
     if !root.is("jingle", JINGLE_NS) {
-        return Err(Error::ParseError("This is not a Jingle element.")),
+        return Err(Error::ParseError("This is not a Jingle element."));
     }
 
     let mut contents: Vec<Content> = vec!();

src/media_element.rs

@@ -19,7 +19,7 @@ pub struct MediaElement {
 
 pub fn parse_media_element(root: &Element) -> Result<MediaElement, Error> {
     if !root.is("media", MEDIA_ELEMENT_NS) {
-        return Err(Error::ParseError("This is not a media element.")),
+        return Err(Error::ParseError("This is not a media element."));
     }
 
     let width = root.attr("width").and_then(|width| width.parse().ok());

src/ping.rs

@@ -10,7 +10,7 @@ pub struct Ping {
 
 pub fn parse_ping(root: &Element) -> Result<Ping, Error> {
     if !root.is("ping", PING_NS) {
-        return Err(Error::ParseError("This is not a ping element.")),
+        return Err(Error::ParseError("This is not a ping element."));
     }
 
     for _ in root.children() {