libceph: remove unused monc->have_fsid

This is unused; use monc->client->have_fsid.

Signed-off-by: Sage Weil <sage@inktank.com>

include/linux/ceph/mon_client.h

@@ -71,7 +71,6 @@ struct ceph_mon_client {
 	int cur_mon;                       /* last monitor i contacted */
 	unsigned long sub_sent, sub_renew_after;
 	struct ceph_connection con;
-	bool have_fsid;
 
 	/* pending generic requests */
 	struct rb_root generic_request_tree;