JStudio/JMessage work and cleanup

src/m_Do/m_Do_main.cpp

@@ -440,7 +440,7 @@ void main01() {
 OSThread mainThread;
 
 /* 80006464-800065DC       .text main */
-void main() {
+int main() {
     OSThread* current_thread = OSGetCurrentThread();
     u8 ALIGN_DECL(0x20) stack[0xF000];
 
@@ -483,5 +483,5 @@ void main() {
     OSCreateThread(&mainThread, (void*)main01, 0, stack + sizeof(stack), sizeof(stack), priority, 0);
     OSResumeThread(&mainThread);
     OSSetThreadPriority(current_thread, 0x1F);
-    OSSuspendThread(current_thread);
+    return OSSuspendThread(current_thread);
 }