Fixed memory leak in testthread

test/testthread.c

@@ -20,6 +20,7 @@
 #include <SDL3/SDL_test.h>
 
 static SDL_TLSID tls;
+static SDL_Thread *thread = NULL;
 static int alive = 0;
 static int testprio = 0;
 static SDLTest_CommonState *state;
@@ -83,13 +84,13 @@ killed(int sig)
     SDL_Log("Killed with SIGTERM, waiting 5 seconds to exit\n");
     SDL_Delay(5 * 1000);
     alive = 0;
+    SDL_WaitThread(thread, NULL);
     quit(0);
 }
 
 int main(int argc, char *argv[])
 {
     int i;
-    SDL_Thread *thread;
 
     /* Initialize test framework */
     state = SDLTest_CommonCreateState(argv, 0);