stream: remove dead code

Remove unreachable code. `state.ended` is always set to true
in this part of the code. The `else` clause can't be executed.

PR-URL: https://github.com/nodejs/node/pull/27125
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

lib/_stream_readable.js

@@ -521,11 +521,7 @@ function onEofChunk(stream, state) {
     state.emittedReadable = true;
     // We have to emit readable now that we are EOF. Modules
     // in the ecosystem (e.g. dicer) rely on this event being sync.
-    if (state.ended) {
-      emitReadable_(stream);
-    } else {
-      process.nextTick(emitReadable_, stream);
-    }
+    emitReadable_(stream);
   }
 }