staging: gpib: Fix lpvo request_system_control

The IEEE-488 GPIB standard was designed to ensure that there is only ever
one controller-in-charge on the bus at any one time. If a board becomes
controller-in-charge on request_system_control there is no way to ensure
that there is not another board also acting as controller-in-charge.
This can lead to bus conflicts and hangs.

Remove the setting of controller-in-charge from request_system_control.

Fixes: fce7951 ("staging: gpib: Add LPVO DIY USB GPIB driver")
Signed-off-by: Dave Penkler <dpenkler@gmail.com>
Link: https://lore.kernel.org/r/20250426150319.5580-1-dpenkler@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: dpenkler

drivers/staging/gpib/lpvo_usb_gpib/lpvo_usb_gpib.c

@@ -916,7 +916,6 @@ static int usb_gpib_request_system_control(struct gpib_board *board, int request
 	if (!request_control)
 		return -EINVAL;
 
-	set_bit(CIC_NUM, &board->status);
 	DIA_LOG(1, "done with %d -> %lx\n", request_control, board->status);
 	return 0;
 }