tethering: Re-add error message about missing bridge functionality

This is back-port from upstream. Commit ID in upstream is
18d852960a02a9939616787043cddea68e92f226

Commit 4fe07df removed an error message about missing bridge functionality.
Return it back.

diff --git a/src/tethering.c b/src/tethering.c
index 860f779..9804e0c 100644 (file)
--- a/src/tethering.c
+++ b/src/tethering.c
@@ -89,8 +89,10 @@ const char *__connman_tethering_get_bridge(void)
        args[1] = args[2] = 0;
        err = ioctl(sk, SIOCGIFBR, &args);
        close(sk);
-       if (err == -1)
+       if (err == -1) {
+               connman_error("Missing support for 802.1d ethernet bridging");
                return NULL;
+       }
 
        return BRIDGE_NAME;
 }