New clangs won't build tors

Quoth Jenkins:

15:19:59 src/or/connection_edge.c:751:69: error: address of array 'entry_conn->socks_request->address' will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]
15:19:59           !entry_conn->socks_request || !entry_conn->socks_request->address)
15:19:59                                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
15:19:59 1 error generated.