staging: ozwpan: Fix incorrect type in assignments

This patch fixes following sparse warnings:
drivers/staging/ozwpan/ozhcd.c:1917:35: warning: incorrect type in
assignment (different base types)
drivers/staging/ozwpan/ozhcd.c:1917:35:    expected restricted __le16
[usertype] wHubCharacteristics
drivers/staging/ozwpan/ozhcd.c:1917:35:    got unsigned short [unsigned]
[usertype] <noident>

Signed-off-by: Melike Yurtoglu <aysemelikeyurtoglu@gmail.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>