staging: wilc1000: directly fetch 'priv' handler from 'vif' instance

The 'priv' handler is already present in 'vif' struct so directly fetch
its value from vif handler in wilc_handle_roc_expired().

Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Link: https://lore.kernel.org/r/20200211152802.6096-2-ajay.kathat@microchip.com


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