staging:ozwpan:Fix sparse warning of cast to restricted __le16

This patch fixes the following sparse warnings:
drivers/staging/ozwpan/ozusbsvc1.c:391:36: warning: cast to restricted __le16
drivers/staging/ozwpan/ozusbsvc1.c:393:33: warning: cast to restricted __le16

Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>