Remove extra all()

src/thread_id.rs

@@ -77,7 +77,7 @@ impl Thread {
 }
 
 cfg_if::cfg_if! {
-    if #[cfg(all(feature = "nightly"))] {
+    if #[cfg(feature = "nightly")] {
         // This is split into 2 thread-local variables so that we can check whether the
         // thread is initialized without having to register a thread-local destructor.
         //