chore: remove tests with invalid fds as Rust hates those

Signed-off-by: Egor Lazarchuk <[email protected]>

Author: ShadowCurse

src/vmm/src/devices/virtio/block/virtio/io/mod.rs

@@ -265,17 +265,7 @@ pub mod tests {
 
     #[test]
     fn test_sync() {
-        // Check invalid file
         let mem = create_mem();
-        let file = unsafe { File::from_raw_fd(-2) };
-        let mut engine = FileEngine::from_file(file, FileEngineType::Sync).unwrap();
-        let res = engine.read(0, &mem, GuestAddress(0), 0, ());
-        assert_err!(res, BlockIoError::Sync(sync_io::SyncIoError::Seek(_e)));
-        let res = engine.write(0, &mem, GuestAddress(0), 0, ());
-        assert_err!(res, BlockIoError::Sync(sync_io::SyncIoError::Seek(_e)));
-        let res = engine.flush(());
-        assert_err!(res, BlockIoError::Sync(sync_io::SyncIoError::SyncAll(_e)));
-
         // Create backing file.
         let file = TempFile::new().unwrap().into_file();
         let mut engine = FileEngine::from_file(file, FileEngineType::Sync).unwrap();
@@ -342,10 +332,6 @@ pub mod tests {
 
     #[test]
     fn test_async() {
-        // Check invalid file
-        let file = unsafe { File::from_raw_fd(-2) };
-        FileEngine::<()>::from_file(file, FileEngineType::Async).unwrap_err();
-
         // Create backing file.
         let file = TempFile::new().unwrap().into_file();
         let mut engine = FileEngine::<()>::from_file(file, FileEngineType::Async).unwrap();