crypto: doc - Fix hash export state information

The documentation states that crypto_ahash_reqsize() provides the size
of the state structure used by crypto_ahash_export().  But it's actually
crypto_ahash_statesize() which provides this size.

Signed-off-by: Rabin Vincent <rabinv@axis.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Documentation/crypto/api-digest.rst

@@ -14,7 +14,7 @@ Asynchronous Message Digest API
    :doc: Asynchronous Message Digest API
 
 .. kernel-doc:: include/crypto/hash.h
-   :functions: crypto_alloc_ahash crypto_free_ahash crypto_ahash_init crypto_ahash_digestsize crypto_ahash_reqtfm crypto_ahash_reqsize crypto_ahash_setkey crypto_ahash_finup crypto_ahash_final crypto_ahash_digest crypto_ahash_export crypto_ahash_import
+   :functions: crypto_alloc_ahash crypto_free_ahash crypto_ahash_init crypto_ahash_digestsize crypto_ahash_reqtfm crypto_ahash_reqsize crypto_ahash_statesize crypto_ahash_setkey crypto_ahash_finup crypto_ahash_final crypto_ahash_digest crypto_ahash_export crypto_ahash_import
 
 Asynchronous Hash Request Handle
 --------------------------------

include/crypto/hash.h

@@ -329,6 +329,16 @@ static inline unsigned int crypto_ahash_digestsize(struct crypto_ahash *tfm)
 	return crypto_hash_alg_common(tfm)->digestsize;
 }
 
+/**
+ * crypto_ahash_statesize() - obtain size of the ahash state
+ * @tfm: cipher handle
+ *
+ * Return the size of the ahash state. With the crypto_ahash_export()
+ * function, the caller can export the state into a buffer whose size is
+ * defined with this function.
+ *
+ * Return: size of the ahash state
+ */
 static inline unsigned int crypto_ahash_statesize(struct crypto_ahash *tfm)
 {
 	return crypto_hash_alg_common(tfm)->statesize;
@@ -369,11 +379,7 @@ static inline struct crypto_ahash *crypto_ahash_reqtfm(
  * crypto_ahash_reqsize() - obtain size of the request data structure
  * @tfm: cipher handle
  *
- * Return the size of the ahash state size. With the crypto_ahash_export
- * function, the caller can export the state into a buffer whose size is
- * defined with this function.
- *
- * Return: size of the ahash state
+ * Return: size of the request data
  */
 static inline unsigned int crypto_ahash_reqsize(struct crypto_ahash *tfm)
 {
@@ -453,7 +459,7 @@ int crypto_ahash_digest(struct ahash_request *req);
  *
  * This function exports the hash state of the ahash_request handle into the
  * caller-allocated output buffer out which must have sufficient size (e.g. by
- * calling crypto_ahash_reqsize).
+ * calling crypto_ahash_statesize()).
  *
  * Return: 0 if the export was successful; < 0 if an error occurred
  */