events: remove unreachable code

Commit 8d386ed7e1 stopped the
Event Emitter implementation from storing arrays containing a
single listener. This change left a section of code in
removeListener() as unreachable. This commit removes the
unreachable code.

Refs: https://github.com/nodejs/node/pull/12043
PR-URL: https://github.com/nodejs/node/pull/12501
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/events.js

@@ -374,22 +374,13 @@ EventEmitter.prototype.removeListener =
         if (position < 0)
           return this;
 
-        if (list.length === 1) {
-          if (--this._eventsCount === 0) {
-            this._events = Object.create(null);
-            return this;
-          } else {
-            delete events[type];
-          }
-        } else if (position === 0) {
+        if (position === 0)
           list.shift();
-          if (list.length === 1)
-            events[type] = list[0];
-        } else {
+        else
           spliceOne(list, position);
+
         if (list.length === 1)
           events[type] = list[0];
-        }
 
         if (events.removeListener)
           this.emit('removeListener', type, originalListener || listener);