staging: ozwpan: remove unneeded __GFP_ZERO to kzalloc() at oz_elt_stream_create()

Get rid of the needless __GFP_ZERO flag for kzalloc() at oz_elt_stream_create().

Signed-off-by: Jie Liu <jeff.liu@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>