iproute2: fix addrlabel interface names handling

ip addrlabel outputs if%d names due to missing init call:
$ ip addrlabel s
prefix a::42/128 dev if4 label 1000

Also, ip did not accept "if%d" interfaces on input.
Signed-off-by: Florian Westphal <fw@strlen.de>

ip/ipaddrlabel.c

@@ -252,6 +252,8 @@ static int ipaddrlabel_flush(int argc, char **argv)
 
 int do_ipaddrlabel(int argc, char **argv)
 {
+	ll_init_map(&rth);
+
 	if (argc < 1) {
 		return ipaddrlabel_list(0, NULL);
 	} else if (matches(argv[0], "list") == 0 ||

lib/ll_map.c

@@ -161,6 +161,7 @@ unsigned ll_name_to_index(const char *name)
 	static int icache;
 	struct idxmap *im;
 	int i;
+	unsigned idx;
 
 	if (name == NULL)
 		return 0;
@@ -176,7 +177,10 @@ unsigned ll_name_to_index(const char *name)
 		}
 	}
 
-	return if_nametoindex(name);
+	idx = if_nametoindex(name);
+	if (idx == 0)
+		sscanf(name, "if%u", &idx);
+	return idx;
 }
 
 int ll_init_map(struct rtnl_handle *rth)