pfctl: zero the number of added/deleted addresses

pfctl re-uses nadd between adding the table and adding the addresses, which lead
to potential incorrect numbers if a table was created in addition to addresses
being added.

Sponsored by:	Rubicon Communications, LLC ("Netgate")

sbin/pfctl/pfctl_radix.c

@@ -122,6 +122,9 @@ pfr_add_addrs(struct pfr_table *tbl, struct pfr_addr *addr, int size,
 {
 	int ret;
 
+	if (*nadd)
+		*nadd = 0;
+
 	ret = pfctl_table_add_addrs_h(pfh, tbl, addr, size, nadd, flags);
 	if (ret) {
 		errno = ret;