staging: ced1401: fix sparse warning for ced1401

This patch fixes below warning.

drivers/staging/ced1401/ced_ioc.c:703:30: warning: incorrect type in assignment (different address spaces)
drivers/staging/ced1401/ced_ioc.c:703:30:    expected void *[usertype] lpvBuff
drivers/staging/ced1401/ced_ioc.c:703:30:    got char [noderef] <asn:1>*puBuf

Signed-off-by: Seunghun Lee <waydi1@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>