crypto: dh - return unsigned value for crypto_dh_key_len()

DH_KPP_SECRET_MIN_SIZE and dh_data_size() are both returning
unsigned values.
Signed-off-by: NTudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

crypto/dh_helper.c

@@ -33,7 +33,7 @@ static inline unsigned int dh_data_size(const struct dh *p)
 	return p->key_size + p->p_size + p->g_size;
 }
 
-int crypto_dh_key_len(const struct dh *p)
+unsigned int crypto_dh_key_len(const struct dh *p)
 {
 	return DH_KPP_SECRET_MIN_SIZE + dh_data_size(p);
 }

include/crypto/dh.h

@@ -53,7 +53,7 @@ struct dh {
  *
  * Return: size of the key in bytes
  */
-int crypto_dh_key_len(const struct dh *params);
+unsigned int crypto_dh_key_len(const struct dh *params);
 
 /**
  * crypto_dh_encode_key() - encode the private key