usb: usbtmc: Fix timeout value in get_stb

usb: usbtmc: Fix timeout value in get_stb

wait_event_interruptible_timeout requires a timeout argument
in units of jiffies. It was being called in usbtmc_get_stb
with the usb timeout value which is in units of milliseconds.

Pass the timeout argument converted to jiffies.

Fixes: 048c6d88a021 ("usb: usbtmc: Add ioctls to set/get usb timeout")
Cc: stable@vger.kernel.org
Signed-off-by: Dave Penkler <dpenkler@gmail.com>
Link: https://lore.kernel.org/r/20250521121656.18174-4-dpenkler@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>