Remove a duplicated line, found by clang

src/or/connection.c

@@ -1240,7 +1240,7 @@ connection_connect(connection_t *conn, const char *address,
 {
   int s, inprogress = 0;
   char addrbuf[256];
-  struct sockaddr *dest_addr = (struct sockaddr*) addrbuf;
+  struct sockaddr *dest_addr;
   socklen_t dest_addr_len;
   or_options_t *options = get_options();
   int protocol_family;