[PATCH 21/28] batctl: rtnl: report correct error on kernel communication problem

When nl_send_auto_complete() fails, an explicit error must be set or
otherwise query_rtnl_link() will return 0 (no error).

Fixes: 60e519bfeaa3 ("batctl: Use rtnl to query list of softif devices")
Signed-off-by: Sven Eckelmann <[email protected]>
---
 functions.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/functions.c b/functions.c
index dc6bf75..ae1c5e2 100644
--- a/functions.c
+++ b/functions.c
@@ -493,8 +493,10 @@ int query_rtnl_link(int ifindex, nl_recvmsg_msg_cb_t func, void *arg)
 	}
 
 	ret = nl_send_auto_complete(sock, msg);
-	if (ret < 0)
+	if (ret < 0) {
+		err = -EIO;
 		goto err_free_msg;
+	}
 
 	nl_recvmsgs(sock, cb);
 

-- 
2.47.3