modify code

Author: algorithmzuo

src/class05/Code04_DoubleLinkedListQuickSort.java

@@ -174,14 +174,9 @@ public static Info partition(Node L, Node pivot) {
 rt = L;
 }
 } else {
-if (eh == null) {
-eh = L;
-et = L;
-} else {
-et.next = L;
-L.last = et;
-et = L;
-}
+et.next = L;
+L.last = et;
+et = L;
 }
 L = tmp;
 }