This patch fixes some misc problems in sgl codes, e.g. missing static,
sparse error and input parameter check.
Signed-off-by: NZhou Wang <wangzhou1@hisilicon.com>
Signed-off-by: NShukun Tan <tanshukun1@huawei.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>