3DS: Fix thread cleanup

CHANGES

@@ -44,6 +44,7 @@ Emulation fixes:
 Other fixes:
  - 3DS: Redo video sync to be more precise
  - 3DS: Fix crash with libctru 2.0 when exiting
+ - 3DS: Fix thread cleanup
  - All: Improve export headers (fixes mgba.io/i/1738)
  - Core: Ensure ELF regions can be written before trying
  - Core: Fix reported ROM size when a fixed buffer size is used

include/mgba-util/platform/3ds/threading.h

@@ -69,12 +69,14 @@ static inline int ThreadCreate(Thread* thread, ThreadEntry entry, void* context)
 	if (!entry || !thread) {
 		return 1;
 	}
-	*thread = threadCreate(entry, context, 0x8000, 0x18, 2, true);
+	*thread = threadCreate(entry, context, 0x8000, 0x18, 2, false);
 	return !*thread;
 }
 
 static inline int ThreadJoin(Thread* thread) {
-	return threadJoin(*thread, U64_MAX);
+	Result res = threadJoin(*thread, U64_MAX);
+	threadFree(*thread);
+	return res;
 }
 
 static inline void ThreadSetName(const char* name) {

src/feature/thread-proxy.c

@@ -206,10 +206,6 @@ static THREAD_ENTRY _proxyThread(void* logger) {
 		}
 	}
 	MutexUnlock(&proxyRenderer->mutex);
-
-#ifdef _3DS
-	svcExitThread();
-#endif
 	return 0;
 }