staging: gpib: tnt4882: remove unused variable

staging: gpib: tnt4882: remove unused variable

Remove unused variable 'retval' in function 'tnt4882_update_status'.

A call to nec7210_update_status_nolock() is added as the status bits are written
to board->status in that function.

This change removes the following warning:

warning: variable ‘retval’ set but not used [-Wunused-but-set-variable]

Signed-off-by: Gaston Gonzalez <gascoar@gmail.com>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/r/20250214195456.104075-9-gascoar@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>