appletalk: fix erroneous return value

The atalk_sendmsg() function might return wrong value ENETUNREACH
instead of -ENETUNREACH.

Signed-off-by: Anton Protopopov <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/appletalk/ddp.c

···
 
 		rt = atrtr_find(&at_hint);
 	}
-	err = ENETUNREACH;
+	err = -ENETUNREACH;
 	if (!rt)
 		goto out;