Fix compile error + warnings

Signed-off-by: Harsha Vamsi Kalluri <[email protected]>

src/core/index/merge/merge_rate_limiter.rs

@@ -14,12 +14,12 @@
 use core::store::RateLimiter;
 
 use core::index::ErrorKind::MergeAborted;
-use std::cell::UnsafeCell;
+
 use error::{ErrorKind, Result};
 
 use std::f64;
 use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
-use std::sync::{Condvar, Mutex, RwLock};
+use std::sync::{Condvar, Mutex};
 use std::time::{Duration, SystemTime};
 
 use core::util::external::Volatile;

src/core/index/merge/merge_scheduler.rs

@@ -213,7 +213,7 @@ impl ConcurrentMergeSchedulerInner {
     #[allow(clippy::mut_from_ref)]
     unsafe fn scheduler_mut(
         &self,
-        _guard: &MutexGuard<(ConcurrentMergeSchedulerInner)>,
+        _guard: &MutexGuard<ConcurrentMergeSchedulerInner>,
     ) -> &mut ConcurrentMergeSchedulerInner {
         let t = self as *const ConcurrentMergeSchedulerInner as *mut ConcurrentMergeSchedulerInner
             as *const UnsafeCell<ConcurrentMergeSchedulerInner>;