staging: ozwpan: Make oz_hcd_pd_departed() take a struct pointer.

oz_hcd_pd_departed() takes struct oz_port pointer instead of
void *, change function declaration to avoid ambiguity.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Rupesh Gujare <rupesh.gujare@atmel.com>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>