Remove redundant "match" when checking userdata type via AnyUserData::is.

Fixes #386

Author: khvzak

src/userdata.rs

@@ -815,11 +815,7 @@ impl OwnedAnyUserData {
 impl<'lua> AnyUserData<'lua> {
     /// Checks whether the type of this userdata is `T`.
     pub fn is<T: 'static>(&self) -> bool {
-        match self.inspect(|_: &UserDataCell<T>| Ok(())) {
-            Ok(()) => true,
-            Err(Error::UserDataTypeMismatch) => false,
-            Err(_) => unreachable!(),
-        }
+        self.inspect(|_: &UserDataCell<T>| Ok(())).is_ok()
     }
 
     /// Borrow this userdata immutably if it is of type `T`.

tests/userdata.rs

@@ -370,6 +370,8 @@ fn test_userdata_take() -> Result<()> {
             r => panic!("improper return for destructed userdata: {:?}", r),
         }
 
+        assert!(!userdata.is::<MyUserdata>());
+
         drop(userdata);
         lua.globals().raw_remove("userdata")?;
         lua.gc_collect()?;