iplink_vrf: Complain if main table is not found

Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: David Ahern <dsahern@gmail.com>

ip/iplink_vrf.c

@@ -131,7 +131,9 @@ __u32 ipvrf_get_table(const char *name)
 					   &answer.n, sizeof(answer)) < 0) {
 		/* special case "default" vrf to be the main table */
 		if (errno == ENODEV && !strcmp(name, "default"))
-			rtnl_rttable_a2n(&tb_id, "main");
+			if (rtnl_rttable_a2n(&tb_id, "main"))
+				fprintf(stderr,
+					"BUG: RTTable \"main\" not found.\n");
 
 		return tb_id;
 	}