Make --hash-password not craash on exit.

svn:r5243

src/or/circuitbuild.c

@@ -1677,10 +1677,12 @@ void
 helper_nodes_free_all(void)
 {
   /* Don't call clear_helper_nodes(); that will flush our state change to disk */
+  if (helper_nodes) {
     SMARTLIST_FOREACH(helper_nodes, helper_node_t *, h, tor_free(h));
     smartlist_free(helper_nodes);
     helper_nodes = NULL;
   }
+}
 
 /** How long (in seconds) do we allow a helper node to be nonfunctional before
  * we give up on it? */

src/or/config.c

@@ -394,12 +394,20 @@ set_options(or_options_t *new_val)
 void
 config_free_all(void)
 {
+  if (global_options) {
     config_free(&options_format, global_options);
+    global_options = NULL;
+  }
+  if (global_state) {
     config_free(&state_format, global_state);
+    global_state = NULL;
+  }
   tor_free(torrc_fname);
+  if (reachable_addr_policy) {
     addr_policy_free(reachable_addr_policy);
     reachable_addr_policy = NULL;
   }
+}
 
 /** If options->SafeLogging is on, return a not very useful string,
  * else return address.

src/or/connection_edge.c

@@ -556,9 +556,14 @@ addressmap_clean(time_t now)
 void
 addressmap_free_all(void)
 {
+  if (addressmap) {
     strmap_free(addressmap, addressmap_ent_free);
     addressmap = NULL;
+  }
+  if (virtaddress_reversemap) {
     strmap_free(virtaddress_reversemap, addressmap_virtaddress_ent_free);
+    virtaddress_reversemap = NULL;
+  }
 }
 
 /** Look at address, and rewrite it until it doesn't want any