[CRYPTO] scatterwalk: Use generic scatterlist chaining

This patch converts the crypto scatterwalk code to use the generic
scatterlist chaining rather the version specific to crypto.

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

crypto/digest.c

···
 #include <linux/scatterlist.h>
 
 #include "internal.h"
-#include "scatterwalk.h"
 
 static int init(struct hash_desc *desc)
 {
···
 
 		if (!nbytes)
 			break;
-		sg = scatterwalk_sg_next(sg);
+		sg = sg_next(sg);
 	}
 
 	return 0;

crypto/hmac.c

···
 
 	sg_init_table(sg1, 2);
 	sg_set_buf(sg1, ipad, bs);
-	sg_set_page(&sg1[1], (void *) sg, 0, 0);
+	sg_chain(sg1, 2, sg);
 
 	sg_init_table(sg2, 1);
 	sg_set_buf(sg2, opad, bs + ds);

crypto/scatterwalk.c

···
 		walk->offset += PAGE_SIZE - 1;
 		walk->offset &= PAGE_MASK;
 		if (walk->offset >= walk->sg->offset + walk->sg->length)
-			scatterwalk_start(walk, scatterwalk_sg_next(walk->sg));
+			scatterwalk_start(walk, sg_next(walk->sg));
 	}
 }
 

crypto/scatterwalk.h

···
 
 #include "internal.h"
 
-static inline struct scatterlist *scatterwalk_sg_next(struct scatterlist *sg)
-{
-	return (++sg)->length ? sg : (void *) sg_page(sg);
-}
-
 static inline unsigned long scatterwalk_samebuf(struct scatter_walk *walk_in,
 						struct scatter_walk *walk_out)
 {