libceph: fix parse options memory leak

ceph_destroy_options does not free opt->mon_addr that
is allocated in ceph_parse_options.

Signed-off-by: Noah Watkins <noahwatkins@gmail.com>
Signed-off-by: Sage Weil <sage@newdream.net>

net/ceph/ceph_common.c

@@ -232,6 +232,7 @@ void ceph_destroy_options(struct ceph_options *opt)
 		ceph_crypto_key_destroy(opt->key);
 		kfree(opt->key);
 	}
+	kfree(opt->mon_addr);
 	kfree(opt);
 }
 EXPORT_SYMBOL(ceph_destroy_options);