[PATCH 2/4] w1: only send_error when there is an error

[David Fries <David@Fries.net>]

Otherwise there's an extra reply being sent out for each async
message.  Some commands such as W1_CMD_LIST_SLAVES will be identical
except one message has data and the other doesn't making it difficult
for a program to know if all the slaves just vanished or what happened.

Signed-off-by: David Fries <David@Fries.net>
---
 drivers/w1/w1_netlink.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/w1/w1_netlink.c b/drivers/w1/w1_netlink.c
index a02704a..a6962f5 100644
--- a/drivers/w1/w1_netlink.c
+++ b/drivers/w1/w1_netlink.c
@@ -423,9 +423,11 @@ static void w1_process_cb(struct w1_master *dev, struct w1_async_cmd *async_cmd)
 			err = w1_process_command_master(dev, &node->block->msg,
 				node->m, cmd);
 
-		w1_netlink_send_error(&node->block->msg, node->m, cmd,
-			node->block->portid, err);
-		err = 0;
+		if (err) {
+			w1_netlink_send_error(&node->block->msg, node->m, cmd,
+				node->block->portid, err);
+			err = 0;
+		}
 
 		cmd_data += cmd->len + sizeof(struct w1_netlink_cmd);
 		mlen -= cmd->len + sizeof(struct w1_netlink_cmd);
-- 
1.7.10.4