int len; 
static ssize_t show_configuration_string(struct device *dev,		struct device_attribute *attr, char *buf){	struct usb_device *udev;	struct usb_host_config *actconfig;	int len;	udev = to_usb_device (dev);	actconfig = udev->actconfig;	if ((!actconfig) || (!actconfig->string))		return 0;	len = sprintf(buf, actconfig->string, PAGE_SIZE);	if (len < 0)		return 0;	buf[len] = '\n';	buf[len+1] = 0;	return len+1;}
4520	/local/tlutelli/issta_data/temp/c/2005_temp/2005/4520/4f62efe67f077db17dad03a1d4c9665000a3eb45/sysfs.c/clean/drivers/usb/core/sysfs.c