Fix many clippy lints

src/sync/rwlock.rs

@@ -74,9 +74,8 @@ impl InnerRwLock {
                     waiting_wr = expected & WAITING_WR;
 
                     if actual & COUNT_MASK > 0 {
-                        match crate::sync::futex_wait(&self.state, expected, relative.as_ref()) {
-                            super::FutexWaitResult::TimedOut => return Err(Errno(ETIMEDOUT)),
-                            _ => {}
+                        if crate::sync::futex_wait(&self.state, expected, relative.as_ref()) == super::FutexWaitResult::TimedOut {
+                            return Err(Errno(ETIMEDOUT))
                         }
                     } else {
                         // We must avoid blocking indefinitely in our `futex_wait()`, in this case
@@ -94,9 +93,8 @@ impl InnerRwLock {
     pub fn acquire_read_lock(&self, deadline: Option<(&timespec, clockid_t)>) -> Result<(), Errno> {
         let relative = Self::translate_timeout(deadline)?;
         while let Err(old) = self.try_acquire_read_lock() {
-            match crate::sync::futex_wait(&self.state, old, relative.as_ref()) {
-                super::FutexWaitResult::TimedOut => return Err(Errno(ETIMEDOUT)),
-                _ => {}
+            if crate::sync::futex_wait(&self.state, old, relative.as_ref()) == super::FutexWaitResult::TimedOut {
+                return Err(Errno(ETIMEDOUT))
             }
         }
 

src/sync/semaphore.rs

@@ -35,17 +35,14 @@ impl Semaphore {
                 return 0;
             }
 
-            match self.count.compare_exchange_weak(
+            if self.count.compare_exchange_weak(
                 value,
                 value - 1,
                 Ordering::SeqCst,
                 Ordering::SeqCst,
-            ) {
-                Ok(_) => {
-                    // Acquired
-                    return value;
-                }
-                Err(_) => (),
+            ).is_ok() {
+                // Acquired
+                return value;
             }
             // Try again (as long as value > 0)
         }