Return an integer instead of void in function that returns an integer

git-svn-id: http://svn.net-core.org/repos/t-engine4@2944 51575b47-30f0-44d4-a5cc-537603b46e54

src/profile.c

@@ -185,7 +185,7 @@ int create_profile_thread(lua_State *L)
 	thread = SDL_CreateThread(thread_profile, profile);
 	if (thread == NULL) {
 		printf("Unable to create profile thread: %s\n", SDL_GetError());
-		return;
+		return -1;
 	}
 	profile->thread = thread;