usbip: usbip_detach: Fix memory, udev context and udev leak

detach_port() fails to call usbip_vhci_driver_close() from its error
path after usbip_vhci_detach_device() returns failure, leaking memory
allocated in usbip_vhci_driver_open() and holding udev_context and udev
references. Fix it to call usbip_vhci_driver_close().

Signed-off-by: Shuah Khan (Samsung OSG) <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

tools/usb/usbip/src/usbip_detach.c

···
 
 static int detach_port(char *port)
 {
-	int ret;
+	int ret = 0;
 	uint8_t portnum;
 	char path[PATH_MAX+1];
 
···
 	}
 
 	ret = usbip_vhci_detach_device(portnum);
-	if (ret < 0)
-		return -1;
+	if (ret < 0) {
+		ret = -1;
+		goto call_driver_close;
+	}
 
+call_driver_close:
 	usbip_vhci_driver_close();
 
 	return ret;