Do not unsubscribe from child once parent has been completed.

Child should not be unsubscribed when the parent complete because it may not be completed.

Author: ylecaillez

rxjava-core/src/main/java/rx/operators/OperationSwitch.java

@@ -173,7 +173,6 @@ public void onError(Throwable e) {
         @Override
         public void onCompleted() {
             synchronized (gate) {
-                this.child.unsubscribe();
                 this.stopped = true;
                 if (!this.hasLatest) {
                     this.observer.onCompleted();