[PATCH v3] usbip: tools: Fix read_usb_vudc_device() error path handling

[GwanYeong Kim]

This isn't really accurate right. fread() doesn't always
return 0 in error. It could return < number of elements
and set errno.

Signed-off-by: GwanYeong Kim <gy741....@gmail.com>
---
 tools/usb/usbip/libsrc/usbip_device_driver.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/usb/usbip/libsrc/usbip_device_driver.c 
b/tools/usb/usbip/libsrc/usbip_device_driver.c
index 051d7d3f443b..927a151fa9aa 100644
--- a/tools/usb/usbip/libsrc/usbip_device_driver.c
+++ b/tools/usb/usbip/libsrc/usbip_device_driver.c
@@ -69,7 +69,7 @@ int read_usb_vudc_device(struct udev_device *sdev, struct 
usbip_usb_device *dev)
        FILE *fd = NULL;
        struct udev_device *plat;
        const char *speed;
-       int ret = 0;
+       size_t ret;
 
        plat = udev_device_get_parent(sdev);
        path = udev_device_get_syspath(plat);
@@ -79,8 +79,10 @@ int read_usb_vudc_device(struct udev_device *sdev, struct 
usbip_usb_device *dev)
        if (!fd)
                return -1;
        ret = fread((char *) &descr, sizeof(descr), 1, fd);
-       if (ret < 0)
+       if (ret != 1) {
+               err("Cannot read vudc device descr file: %s", strerror(errno));
                goto err;
+       }
        fclose(fd);
 
        copy_descr_attr(dev, &descr, bDeviceClass);
-- 
2.17.1