Fix clang warning, IPv6 address comment, buffer size typo

The address of an array in the middle of a structure will
always be non-NULL. clang recognises this and complains.
Disable the tautologous and redundant check to silence
this warning.

Fixes bug 14001.

changes/bug14001-clang-warning

@@ -0,0 +1,6 @@
+  o Minor bugfixes:
+    - The address of an array in the middle of a structure will
+      always be non-NULL. clang recognises this and complains.
+      Disable the tautologous and redundant check to silence
+      this warning.
+      Fixes bug 14001.

src/or/connection_edge.c

@@ -744,8 +744,9 @@ connection_ap_fail_onehop(const char *failed_digest,
       /* we don't know the digest; have to compare addr:port */
       tor_addr_t addr;
       if (!build_state || !build_state->chosen_exit ||
-          !entry_conn->socks_request || !entry_conn->socks_request->address)
+          !entry_conn->socks_request) {
         continue;
+      }
       if (tor_addr_parse(&addr, entry_conn->socks_request->address)<0 ||
           !tor_addr_eq(&build_state->chosen_exit->addr, &addr) ||
           build_state->chosen_exit->port != entry_conn->socks_request->port)