Cleaned up some StrongRef-related code.

src/modules/filesystem/wrap_File.cpp

@@ -108,13 +108,13 @@ int w_File_isOpen(lua_State *L)
 int w_File_read(lua_State *L)
 {
 	File *file = luax_checkfile(L, 1);
-	Data *d = 0;
+	StrongRef<Data> d = nullptr;
 
 	int64 size = (int64) luaL_optnumber(L, 2, (lua_Number) File::ALL);
 
 	try
 	{
-		d = file->read(size);
+		d.set(file->read(size), Acquire::NORETAIN);
 	}
 	catch (love::Exception &e)
 	{
@@ -123,7 +123,6 @@ int w_File_read(lua_State *L)
 
 	lua_pushlstring(L, (const char *) d->getData(), d->getSize());
 	lua_pushnumber(L, d->getSize());
-	d->release();
 	return 2;
 }
 

src/modules/filesystem/wrap_Filesystem.cpp

@@ -223,17 +223,16 @@ int w_newFileData(lua_State *L)
 		{
 			File *file = luax_checkfile(L, 1);
 
-			FileData *data = 0;
+			StrongRef<FileData> data;
 			try
 			{
-				data = file->read();
+				data.set(file->read(), Acquire::NORETAIN);
 			}
 			catch (love::Exception &e)
 			{
 				return luax_ioError(L, "%s", e.what());
 			}
 			luax_pushtype(L, FILESYSTEM_FILE_DATA_ID, data);
-			data->release();
 			return 1;
 		}
 		else