Fix comments that implied that only dir connections had a purpose field, and the code that believed in those comments.

svn:r6918

src/or/connection.c

@@ -2235,9 +2235,9 @@ assert_connection_ok(connection_t *conn, time_t now)
       tor_assert(conn->purpose == EXIT_PURPOSE_CONNECT ||
                  conn->purpose == EXIT_PURPOSE_RESOLVE);
     }
-  }
-  if (conn->type != CONN_TYPE_DIR) {
-    tor_assert(!conn->purpose); /* only used for dir types currently */
+  } else if (conn->type != CONN_TYPE_DIR) {
+    /* Purpose is only used for dir and exit types currently */
+    tor_assert(!conn->purpose);
   }
 
   switch (conn->type)

src/or/or.h

@@ -605,7 +605,7 @@ struct connection_t {
 
   uint8_t type; /**< What kind of connection is this? */
   uint8_t state; /**< Current state of this connection. */
-  uint8_t purpose; /**< Only used for DIR types currently. */
+  uint8_t purpose; /**< Only used for DIR and EXIT types currently. */
   unsigned wants_to_read:1; /**< Boolean: should we start reading again once
                             * the bandwidth throttler allows it? */
   unsigned wants_to_write:1; /**< Boolean: should we start writing again once