crypto: caam - pass the correct buffer length

When buffer 0 is used we should use buflen_0 instead of buflen_1.

Fix it.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/caam/caamhash.c

@@ -1596,7 +1596,7 @@ static int ahash_export(struct ahash_request *req, void *out)
 		len = state->buflen_1;
 	} else {
 		buf = state->buf_0;
-		len = state->buflen_1;
+		len = state->buflen_0;
 	}
 
 	memcpy(export->buf, buf, len);