Android: Fix missing or corrupt service name

The publish service name and type are passed to startServicePublish() as
char pointers.  startServicePublish() calls runOnAndroidThread which asks
the java code to run registerService().  If name and type are objects on
the stack, they could get freed  / deleted before the registerService() is
run in the java thread which would cause registerService() to use deleted
objects.  Fix --> make permanent objects for name and type.

androidnsd.cpp

@@ -77,6 +77,8 @@ QZeroConfPrivate::~QZeroConfPrivate()
 void QZeroConfPrivate::startServicePublish(const char *name, const char *type, quint16 port)
 {
  QAndroidJniObject ref(nsdManager);
+ publishName = name;
+ publishType = type;
  QtAndroid::runOnAndroidThread([=](){
  QAndroidJniObject txtMap("java/util/HashMap");
  foreach (const QByteArray &key, txtRecords.keys()) {
@@ -86,8 +88,8 @@ void QZeroConfPrivate::startServicePublish(const char *name, const char *type, q
  }
 
  ref.callMethod<void>("registerService", "(Ljava/lang/String;Ljava/lang/String;ILjava/util/Map;)V",
- QAndroidJniObject::fromString(QString(name)).object<jstring>(),
- QAndroidJniObject::fromString(QString(type)).object<jstring>(),
+ QAndroidJniObject::fromString(publishName).object<jstring>(),
+ QAndroidJniObject::fromString(publishType).object<jstring>(),
  port,
  txtMap.object());
  });

androidnsd_p.h

@@ -54,6 +54,8 @@ class QZeroConfPrivate: QObject
  bool browserExists = false;
  bool publisherExists = false;
  QMap<QByteArray, QByteArray> txtRecords;
+ QString publishName;
+ QString publishType;
 
 
 private slots: