uefi-raw: Mark DevicePathProtocol as packed

It does not matter for the header as it only contain u8s. However more
complex device paths that need to embed the header are also packed structs.

Signed-off-by: Mate Kukri <[email protected]>

Author: kukrimate

uefi-raw/src/protocol/device_path.rs

@@ -8,7 +8,7 @@ use crate::{guid, Char16, Guid};
 /// Note that the fields in this struct define the header at the start of each
 /// node; a device path is typically larger than these four bytes.
 #[derive(Debug)]
-#[repr(C)]
+#[repr(C,packed)]
 pub struct DevicePathProtocol {
     pub major_type: u8,
     pub sub_type: u8,