fix audio-linter warning

include/fggl/audio/audio.hpp

@@ -27,10 +27,10 @@ namespace fggl::audio {
 	 * If the sampleCount is -1, the clip is invalid.
 	 */
 	struct AudioClip {
-		int channels;
-		int sampleRate;
-		int sampleCount;
-		short* data;
+		int channels = 0;
+		int sampleRate = 0;
+		int sampleCount = -1;
+		short* data = nullptr;
 	};
 
 	constexpr modules::ModuleService SERVICE_AUDIO_PLAYBACK = modules::make_service("fggl::audio::AudioService");