[raudio] Fix load and unload issues with Music (#1588)

* Add MUSIC_AUDIO_NONE to MusicContextType and format fixes
- Useful to check the context type to see if the format is recognized. Defaulting to wav causes issues where formats are assumed to
be wav.

* Fix memory issues with LoadMusicStream and UnloadMusicStream
- Set ctxType and ctxData even if the format fails to load.
- Set ctxData to NULL if it fails and check for null inside UnloadMusicStream.
- Change RL_MALLOC when loading formats to RL_CALLOC to prevent undefined behavior.
- Add NULL check when unloading xm file.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/external/jar_xm.h b/src/external/jar_xm.h
index 1839e619..bfd63ec0 100644
--- a/src/external/jar_xm.h
+++ b/src/external/jar_xm.h
@@ -696,7 +696,9 @@ int jar_xm_create_context_safe(jar_xm_context_t** ctxp, const char* moddata, siz
 }
 
 void jar_xm_free_context(jar_xm_context_t* ctx) {
-    JARXM_FREE(ctx->allocated_memory);
+    if (ctx != NULL) {
+        JARXM_FREE(ctx->allocated_memory);
+    }
 }
 
 void jar_xm_set_max_loop_count(jar_xm_context_t* ctx, uint8_t loopcnt) {