crypto: talitos - avoid out of bound scatterlist iterator

Check return value of scatterlist_sg_next(), i.e. don't rely solely
on number of bytes to be processed or number of scatterlist entries.

Signed-off-by: Horia Geanta <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

drivers/crypto/talitos.c

···
 {
 	int n_sg = sg_count;
 
-	while (n_sg--) {
+	while (sg && n_sg--) {
 		to_talitos_ptr(link_tbl_ptr, sg_dma_address(sg), 0);
 		link_tbl_ptr->len = cpu_to_be16(sg_dma_len(sg));
 		link_tbl_ptr->j_extent = 0;
···
 	int sg_nents = 0;
 
 	*chained = false;
-	while (nbytes > 0) {
+	while (nbytes > 0 && sg) {
 		sg_nents++;
 		nbytes -= sg->length;
 		if (!sg_is_last(sg) && (sg + 1)->length == 0)