staging: wilc1000: use 'int' inplace of 's32' date type

Cleanup patch to use 'int' instead of 's32' to have the same data type
based on its usage.

Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>