networkd-wait-online: add missing short option 'i' to optstring

src/network/networkd-wait-online.c

@@ -59,7 +59,7 @@ static int parse_argv(int argc, char *argv[]) {
         assert(argc >= 0);
         assert(argv);
 
-        while ((c = getopt_long(argc, argv, "+hq", options, NULL)) >= 0)
+        while ((c = getopt_long(argc, argv, "+hiq", options, NULL)) >= 0)
 
                 switch (c) {