drivers/staging/usbip/userspace/libsrc/vhci_driver.c: test the just-initialized value

Test the just-initialized value rather than some other one.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r@
identifier x,y,f!={PTR_ERR,ERR_PTR,ERR_CAST};
statement S;
@@

x = f(...);
(
if (\(x == NULL\|IS_ERR(x)\)) S
|
*if (\(y == NULL\|IS_ERR(y)\))
 { ... when != x
   return ...; }
)
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Acked-by: David Chang <dchang@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/usbip/userspace/libsrc/vhci_driver.c

@@ -133,7 +133,7 @@ static int check_usbip_device(struct sysfs_class_device *cdev)
 			     strlen(vhci_driver->hc_device->path))) {
 			/* found usbip device */
 			usbip_cdev = calloc(1, sizeof(*usbip_cdev));
-			if (!cdev) {
+			if (!usbip_cdev) {
 				dbg("calloc failed");
 				return -1;
 			}