[raudio] Fix memory leak when loading .wav files

[LuisR385]

Title

Fix memory leak in UnloadMusicStream() for WAV files on MSVC Debug builds

---

Summary

This PR fixes a memory leak that occurs when unloading a WAV music stream using UnloadMusicStream().

On Windows 11 with MSVC (Visual Studio 2022, x64 Debug), the Microsoft CRT Debug Heap reports a remaining allocation after the application exits, even though UnloadMusicStream() has been called.

The leak is caused by the decoder context (Music.ctxData) not being fully released.

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Environment

• OS: Windows 11
• Architecture: x64
• Compiler: MSVC
• IDE: Visual Studio 2022
• Configuration: Debug
• Audio file: WAV

---

Reproduction

#include <raylib.h>
#include <crtdbg.h>
#include <memory.h>
#include <stdlib.h>

int main(void)
{
    _CrtSetDbgFlag(_CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF);

    const int screenWidth = 800;
    const int screenHeight = 450;

    InitWindow(screenWidth, screenHeight, "raylib leak test");

    SetTargetFPS(60);

    Music music = LoadMusicStream("./Assets/boss-round.wav");

    while (!WindowShouldClose())
    {
        BeginDrawing();

        ClearBackground(RAYWHITE);

        DrawText("Memory Leak Test", 190, 200, 20, LIGHTGRAY);

        EndDrawing();
    }

    UnloadMusicStream(music);

    CloseWindow();

    return 0;
}

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Actual Result

The Microsoft CRT Debug Heap reports the following memory leak:

Detected memory leaks!
Dumping objects ->
{750} normal block at 0x00000228567A03B0, 408 bytes long.
 Data: < |              > E0 7C CF EA F7 7F 00 00 00 00 00 00 00 00 00 00
Object dump complete.

---

Expected Result

UnloadMusicStream() should release all memory allocated by LoadMusicStream().

No memory leaks should be reported after the application exits.

---

Investigation

The leaked allocation appears to originate from the internal decoder context stored in Music.ctxData.

Manually releasing this pointer removes the leak:

RL_FREE(music.ctxData);

However, ctxData is an internal implementation detail and should not need to be released by user code.

Its lifetime should be managed entirely by raylib.

---

Fix

Release the decoder-specific context (ctxData) during UnloadMusicStream() so that all resources allocated by LoadMusicStream() are properly cleaned up.

This keeps ownership of internal resources inside raylib and eliminates the reported memory leak.

---

Verification

Tested with:

• Windows 11
• Visual Studio 2022
• MSVC x64 Debug
• CRT Debug Heap (_CrtSetDbgFlag)
• WAV music file

After this change, no memory leaks are reported.

[raysan5]

@LuisR385 good catch! Thanks for the review!