fix: Windows FFI mistakenly using BufReader

Another commit fixing a Windows-specific issue. This
time that the BufReader import was removed, and Unix
uses of it in the FFI code were removed, but not for
Windows code, causing compilation failure on Windows.

This commit fixes the issue.

Signed-off-by: Andrew Lilley Brinker <[email protected]>

gitoid/src/ffi/gitoid.rs

@@ -240,8 +240,7 @@ macro_rules! generate_gitoid_ffi_for_hash {
             ) -> *const [<GitOid $hash_ty $object_ty>] {
                 let output = catch_panic(|| {
                     let file = unsafe { File::from_raw_handle(handle) };
-                    let reader = BufReader::new(file);
-                    let gitoid = GitOid::<$hash_ty, $object_ty>::from_reader(reader)?;
+                    let gitoid = GitOid::<$hash_ty, $object_ty>::from_reader(file)?;
                     let boxed = Box::new(gitoid);
                     Ok(Box::into_raw(boxed) as *const _)
                 });
@@ -266,8 +265,7 @@ macro_rules! generate_gitoid_ffi_for_hash {
                 let output = catch_panic(|| {
                     let file = unsafe { File::from_raw_handle(handle) };
                     let expected_length = expected_length as usize;
-                    let reader = BufReader::new(file);
-                    let gitoid = GitOid::<$hash_ty, $object_ty>::from_reader_with_expected_length(reader, expected_length)?;
+                    let gitoid = GitOid::<$hash_ty, $object_ty>::from_reader_with_expected_length(file, expected_length)?;
                     let boxed = Box::new(gitoid);
                     Ok(Box::into_raw(boxed) as *const _)
                 });