attach_to_bridge(): Improve error message.

if_nametoindex() sets errno on errors, so let's print the error
string using %m.

diff --git a/util.c b/util.c
index ebe5b1e..08f4832 100644 (file)
--- a/util.c
+++ b/util.c
@@ -526,7 +526,7 @@ bool attach_to_bridge(const char *iface, const char *bridge)
 
        INFO_LOG("adding interface %s to bridge %s\n", iface, bridge);
        if (!(idx = if_nametoindex(iface))) {
-               ERROR_LOG("no index for %s\n", iface);
+               ERROR_LOG("no index for %s: %m\n", iface);
                return false;
        }
        if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {