[PATCH v2] rust_binder: Fix build failure if !CONFIG_COMPAT

[Xi Ruoyao]

The bindgen utility cannot handle "#define compat_ptr_ioctl NULL" in the
C header, so we need to handle this case on our own.

Simply skip this field in the initializer when !CONFIG_COMPAT as the
SAFETY comment above this initializer implies this is allowed.

Reported-by: Miguel Ojeda <ojeda@xxxxxxxxxx>
Closes: https://lore.kernel.org/all/CANiq72mrVzqXnAV=Hy2XBOonLHA6YQgH-ckZoc_h0VBvTGK8rA@xxxxxxxxxxxxxx/
Fixes: eafedbc7c050 ("rust_binder: add Rust Binder driver")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Xi Ruoyao <xry111@xxxxxxxxxxx>
---

Changes from v1: fix Miguel's mail address and add tags for stable
backport.

 drivers/android/binder/rust_binder_main.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/android/binder/rust_binder_main.rs b/drivers/android/binder/rust_binder_main.rs
index 47bfb114cabb..e70f250bb4cd 100644
--- a/drivers/android/binder/rust_binder_main.rs
+++ b/drivers/android/binder/rust_binder_main.rs
@@ -312,6 +312,7 @@ unsafe impl<T> Sync for AssertSync<T> {}
         owner: THIS_MODULE.as_ptr(),
         poll: Some(rust_binder_poll),
         unlocked_ioctl: Some(rust_binder_ioctl),
+        #[cfg(CONFIG_COMPAT)]
         compat_ioctl: Some(bindings::compat_ptr_ioctl),
         mmap: Some(rust_binder_mmap),
         open: Some(rust_binder_open),
-- 
2.53.0