eliminate an unwrap in gdt for x86_shared

src/sync/wait_condition.rs

@@ -127,7 +127,7 @@ impl WaitCondition {
         waited
     }
 
-    pub fn into_drop(mut self, token: &mut CleanLockToken) {
+    pub fn into_drop(self, token: &mut CleanLockToken) {
         ManuallyDrop::new(self).inner_drop(token);
     }