Merge #6796

6796: CSound: Initialize all members (fixes #6795) r=Robyt3 a=def-

## Checklist

- [ ] Tested the change ingame
- [ ] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test (especially base/) or added coverage to integration test
- [ ] Considered possible null pointers and out of bounds array indexing
- [ ] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)


Co-authored-by: Dennis Felsing <dennis@felsin9.de>

src/engine/client/sound.cpp

@@ -275,6 +275,11 @@ static void SdlCallback(void *pUnused, Uint8 *pStream, int Len)
 #endif
 }
 
+CSound::CSound() :
+	m_SoundEnabled(false), m_Device(0), m_pGraphics(nullptr), m_pStorage(nullptr)
+{
+}
+
 int CSound::Init()
 {
 	m_SoundEnabled = false;

src/engine/client/sound.h

@@ -28,6 +28,7 @@ class CSound : public IEngineSound
 	static int DecodeOpus(int SampleID, const void *pData, unsigned DataSize);
 
 public:
+	CSound();
 	int Init() override;
 	int Update() override;
 	void Shutdown() override;