staging: gpib: fix kernel-doc section for function usb_gpib_interface_clear()

Add '@' character in kernel-doc comment in order 'assert' to be picked as
argument by the kernel-doc compiler.

This change fix the following warning:

warning: Function parameter or struct member 'assert' not described in
'usb_gpib_interface_clear'

Signed-off-by: Gaston Gonzalez <gascoar@gmail.com>
Link: https://lore.kernel.org/r/20250305193614.39604-5-gascoar@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>