rem: return bytes;
add: RETURN_AND_SET_ERRNO(bytes);
context: fs_write_attr(int fd, const char *attribute, uint32 type, off_t pos, const void *buffer, size_t readBytes){	ssize_t bytes;	int attr = sys_create_attr(fd, attribute, type, O_WRONLY);	if (attr < 0)		return attr;	bytes = sys_write(fd, pos, buffer, readBytes);	sys_close(attr);	return bytes;}