ip-link: fix column alignment

Width is the maximum number of characters used for the value, excluding a
field separator. So append a single whitespace.

ip/ipaddress.c

@@ -327,7 +327,7 @@ static void print_num(FILE *fp, unsigned width, uint64_t count)
 	char buf[64];
 
 	if (!human_readable || count < base) {
-		fprintf(fp, "%-*"PRIu64, width, count);
+		fprintf(fp, "%-*"PRIu64" ", width, count);
 		return;
 	}