usb: usbtmc: uninitialized symbol 'actual' in usbtmc_ioctl_abort_bulk_in_tag

Fix uninitialized symbol 'actual' in function
usbtmc_ioctl_abort_bulk_in_tag().

When symbol 'actual' is not initialized and usb_bulk_msg() fails,
the subsequent kernel debug message shows invalid data.
Signed-off-by: Guido Kiener <guido.kiener@rohde-schwarz.com>
Fixes: cbe743f1 ("usb: usbtmc: Fix ioctl USBTMC_IOCTL_ABORT_BULK_IN")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/class/usbtmc.c

@@ -321,6 +321,7 @@ static int usbtmc_ioctl_abort_bulk_in_tag(struct usbtmc_device_data *data,
 	dev_dbg(dev, "Reading from bulk in EP\n");
 
 	/* Data must be present. So use low timeout 300 ms */
+	actual = 0;
 	rv = usb_bulk_msg(data->usb_dev,
 			  usb_rcvbulkpipe(data->usb_dev,
 					  data->bulk_in),