Add op name to hfa API stats output if it exists.
diff --git a/driver-hashfast.c b/driver-hashfast.c
index d058319..c827715 100644
--- a/driver-hashfast.c
+++ b/driver-hashfast.c
@@ -1590,6 +1590,8 @@ static struct api_data *hfa_api_stats(struct cgpu_info *cgpu)
varint = db->sequence_modulus;
root = api_add_int(root, "sequence modulus", &varint, true);
root = api_add_int(root, "fan percent", &info->fanspeed, false);
+ if (info->op_name[0] != '\0')
+ root = api_add_string(root, "op name", info->op_name, false);
s1 = &info->stats1;
root = api_add_uint64(root, "rx preambles", &s1->usb_rx_preambles, false);