OpenSSL: Fix hmac_sha384_vector() implementation

The output length was incorrect (32 from the copy-pasted SHA256
version). Fix this to return the correct number of octets (48) for
SHA384. This fixes incorrect key derivation in FILS when using the
SHA384-based AKM.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>

src/crypto/crypto_openssl.c

@@ -1031,7 +1031,7 @@ int hmac_sha384_vector(const u8 *key, size_t key_len, size_t num_elem,
 		       const u8 *addr[], const size_t *len, u8 *mac)
 {
 	return openssl_hmac_vector(EVP_sha384(), key, key_len, num_elem, addr,
-				   len, mac, 32);
+				   len, mac, 48);
 }