Fix more of bug 997.

Fix refetching of hidden service descriptors when all introduction points
have turned out to not work.

src/or/rendclient.c

@@ -447,10 +447,9 @@ directory_get_from_hs_dir(const char *desc_id, const rend_data_t *rend_query)
   return 1;
 }
 
-/** Start a connection to a hidden service directory to fetch a v2
- * rendezvous service descriptor for the base32-encoded service ID
- * <b>query</b>.
- */
+/** Unless we already have a descriptor for <b>rend_query</b> with at least
+ * one (possibly) working introduction point in it, start a connection to a
+ * hidden service directory to fetch a v2 rendezvous service descriptor. */
 void
 rend_client_refetch_v2_renddesc(const rend_data_t *rend_query)
 {