Fix libsdl-org#3596, free all TLS data at the end of SDL_Quit to av…

…oid memory leak

src/SDL.c

@@ -447,6 +447,9 @@ SDL_Quit(void)
      */
     SDL_memset( SDL_SubsystemRefCount, 0x0, sizeof(SDL_SubsystemRefCount) );
 
+    /* Cleanup all TLS data */
+    SDL_Generic_CleanupAllTLSData();
+
     SDL_bInMainQuit = SDL_FALSE;
 }
 

src/thread/SDL_thread.c

@@ -200,6 +200,12 @@ SDL_Generic_SetTLSData(SDL_TLSData *storage)
     return 0;
 }
 
+void
+SDL_Generic_CleanupAllTLSData(void)
+{
+    SDL_TLSCleanup();
+}
+
 /* Routine to get the thread-specific error variable */
 SDL_error *
 SDL_GetErrBuf(void)

src/thread/SDL_thread_c.h

@@ -97,6 +97,9 @@ extern SDL_TLSData *SDL_Generic_GetTLSData(void);
  */
 extern int SDL_Generic_SetTLSData(SDL_TLSData *data);
 
+/* Cleanup all TLS data for this thread. */
+extern void SDL_Generic_CleanupAllTLSData(void);
+
 #endif /* SDL_thread_c_h_ */
 
 /* vi: set ts=4 sw=4 expandtab: */