ip: fix exit code for addrlabel

The exit code for ip label was not correct.
The return from the command function is negated and turned into
the exit code on failure.

ip/ipaddrlabel.c

@@ -183,7 +183,7 @@ static int ipaddrlabel_modify(int cmd, int argc, char **argv)
 		req.ifal.ifal_family = AF_INET6;
 
 	if (rtnl_talk(&rth, &req.n, 0, 0, NULL) < 0)
-		return 2;
+		return -2;
 
 	return 0;
 }
@@ -232,12 +232,12 @@ static int ipaddrlabel_flush(int argc, char **argv)
 
 	if (rtnl_wilddump_request(&rth, af, RTM_GETADDRLABEL) < 0) {
 		perror("Cannot send dump request");
-		return 1;
+		return -1;
 	}
 
 	if (rtnl_dump_filter(&rth, flush_addrlabel, NULL) < 0) {
 		fprintf(stderr, "Flush terminated\n");
-		return 1;
+		return -1;
 	}
 
 	return 0;