espeak: remove c style zero initialize

src/GAudioOutput.cc

@@ -97,8 +97,7 @@ GAudioOutput::GAudioOutput(QObject *parent) : QObject(parent),
 
 #if defined Q_OS_LINUX && defined QGC_SPEECH_ENABLED
     espeak_Initialize(AUDIO_OUTPUT_PLAYBACK, 500, NULL, 0); // initialize for playback with 500ms buffer and no options (see speak_lib.h)
-    espeak_VOICE espeak_voice;
-    memset(&espeak_voice, 0, sizeof(espeak_VOICE)); // Zero out the voice first
+    espeak_VOICE espeak_voice = {};
     espeak_voice.languages = "en-uk"; // Default to British English
     espeak_voice.name = "klatt"; // espeak voice name
     espeak_voice.gender = 2; // Female