olpc-cjson: fix clippy warnings

Author: cbgbt

olpc-cjson/src/lib.rs

@@ -105,8 +105,7 @@ impl CanonicalFormatter {
     /// Returns a mutable reference to the top of the object stack.
     fn obj_mut(&mut self) -> Result<&mut Object> {
         self.object_stack.last_mut().ok_or_else(|| {
-            Error::new(
-                ErrorKind::Other,
+            Error::other(
                 "serde_json called an object method without calling begin_object first",
             )
         })
@@ -229,8 +228,7 @@ impl Formatter for CanonicalFormatter {
 
     fn end_object<W: Write + ?Sized>(&mut self, writer: &mut W) -> Result<()> {
         let object = self.object_stack.pop().ok_or_else(|| {
-            Error::new(
-                ErrorKind::Other,
+            Error::other(
                 "serde_json called Formatter::end_object object method
                  without calling begin_object first",
             )