client/server: don't reset ipv6 expectations

fio_server_parse_host() no longer falls back to ipv4, so just
pass in the actual value, not a reference.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/server.h b/server.h
index 57e15d7..adb190a 100644
--- a/server.h
+++ b/server.h
@@ -156,7 +156,7 @@
 extern int fio_net_send_simple_cmd(int, uint16_t, uint64_t, struct flist_head *);
 extern void fio_server_set_arg(const char *);
 extern int fio_server_parse_string(const char *, char **, int *, int *, struct in_addr *, struct in6_addr *, int *);
-extern int fio_server_parse_host(const char *, int *, struct in_addr *, struct in6_addr *);
+extern int fio_server_parse_host(const char *, int, struct in_addr *, struct in6_addr *);
 extern const char *fio_server_op(unsigned int);
 extern void fio_server_got_signal(int);