rust: hpet: fix fw_cfg handling

HPET ids for fw_cfg are not assigned correctly, because there
is a read but no write.  This is caught by nightly Rust as
an unused-assignments warning, so fix it.

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/rust/hw/timer/hpet/src/fw_cfg.rs b/rust/hw/timer/hpet/src/fw_cfg.rs
index e569b57b93b53e26838a88a3160043fa01dd24e0..bb4ea8909ad9ea405f0309a3bff00ce77e0354a7 100644 (file)
--- a/rust/hw/timer/hpet/src/fw_cfg.rs
+++ b/rust/hw/timer/hpet/src/fw_cfg.rs
@@ -40,7 +40,7 @@ impl HPETFwConfig {
         assert!(bql::is_locked());
         // SAFETY: all accesses go through these methods, which guarantee
         // that the accesses are protected by the BQL.
-        let mut fw_cfg = unsafe { *addr_of_mut!(hpet_fw_cfg) };
+        let fw_cfg = unsafe { &mut *addr_of_mut!(hpet_fw_cfg) };
 
         if fw_cfg.count == u8::MAX {
             // first instance
@@ -60,7 +60,7 @@ impl HPETFwConfig {
         assert!(bql::is_locked());
         // SAFETY: all accesses go through these methods, which guarantee
         // that the accesses are protected by the BQL.
-        let mut fw_cfg = unsafe { *addr_of_mut!(hpet_fw_cfg) };
+        let fw_cfg = unsafe { &mut *addr_of_mut!(hpet_fw_cfg) };
 
         fw_cfg.hpet[hpet_id].event_timer_block_id = timer_block_id;
         fw_cfg.hpet[hpet_id].address = address;