[PATCH 2/2] rust: drm: fix non-const `read8` in unit test

[Gary Guo <gary@kernel.org>]

From: Gary Guo <gary@garyguo.net>

With CONFIG_CC_OPTIMIZE_FOR_SIZE, the address validity check in non-const
`read8` invocaction is not optimized away, leading to build failure.

Signed-off-by: Gary Guo <gary@garyguo.net>
---
 rust/kernel/drm/gem/shmem.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rust/kernel/drm/gem/shmem.rs b/rust/kernel/drm/gem/shmem.rs
index 580e0808d6c0..a687d46d170d 100644
--- a/rust/kernel/drm/gem/shmem.rs
+++ b/rust/kernel/drm/gem/shmem.rs
@@ -688,7 +688,7 @@ fn vmap_io() -> Result {
         // Ensure the ordering in memory is correct
         let expected = 0xFEDCBA98_u32.to_ne_bytes().into_iter();
         for (offset, expected) in (0x20..=0x23).zip(expected) {
-            assert_eq!(vmap.read8(offset), expected);
+            assert_eq!(vmap.try_read8(offset).unwrap(), expected);
         }
 
         Ok(())
-- 
2.54.0