staging: ced1401: remove useless value cast on kmalloc()

Casting value returned by k[cmz]alloc to (struct page * *) is useless.

Generated by: scripts/coccinelle/api/alloc/drop_kmalloc_cast.cocci

Reported-by: Fengguang Wu <fengguang.wu@intel.com>

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>