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: Tudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2 files changed