Remove unnecessary unsafe block from condvar_atomics & mutex_atomics

Author: chansuke

library/std/src/sys/wasm/condvar_atomics.rs

@@ -53,7 +53,7 @@ impl Condvar {
     #[inline]
     pub unsafe fn notify_all(&self) {
         self.cnt.fetch_add(1, SeqCst);
-        // SAFETY: memory_atomic_notify()is always valid
+        // SAFETY: ptr() is always valid
         unsafe {
             wasm32::memory_atomic_notify(self.ptr(), u32::MAX); // -1 == "wake everyone"
         }

library/std/src/sys/wasm/mutex_atomics.rs

@@ -50,7 +50,7 @@ impl Mutex {
 
     #[inline]
     pub unsafe fn try_lock(&self) -> bool {
-        unsafe { self.locked.compare_exchange(0, 1, SeqCst, SeqCst).is_ok() }
+        self.locked.compare_exchange(0, 1, SeqCst, SeqCst).is_ok()
     }
 
     #[inline]
@@ -86,7 +86,7 @@ unsafe impl Sync for ReentrantMutex {}
 
 impl ReentrantMutex {
     pub const unsafe fn uninitialized() -> ReentrantMutex {
-        unsafe { ReentrantMutex { owner: AtomicU32::new(0), recursions: UnsafeCell::new(0) } }
+        ReentrantMutex { owner: AtomicU32::new(0), recursions: UnsafeCell::new(0) }
     }
 
     pub unsafe fn init(&self) {