Try to fix more Dialyzer warnings

src/ejabberd_auth.erl

@@ -71,7 +71,7 @@
 -callback get_vh_registered_users(binary(), opts()) -> [{binary(), binary()}].
 -callback get_vh_registered_users_number(binary()) -> number().
 -callback get_vh_registered_users_number(binary(), opts()) -> number().
--callback get_password(binary(), binary()) -> false | binary().
+-callback get_password(binary(), binary()) -> false | binary() | {binary(), binary(), binary(), integer()}.
 -callback get_password_s(binary(), binary()) -> binary().    
 
 start() ->
@@ -267,7 +267,7 @@ get_vh_registered_users_number(Server, Opts) ->
 			end,
 			auth_modules(Server))).
 
--spec get_password(binary(), binary()) -> false | binary().
+-spec get_password(binary(), binary()) -> false | binary() | {binary(), binary(), binary(), integer()}.
 
 get_password(User, Server) ->
     lists:foldl(fun (M, false) ->

src/ejabberd_c2s.erl

@@ -1737,7 +1737,7 @@ handle_info(system_shutdown, StateName, StateData) ->
 	  ok
     end,
     {stop, normal, StateData};
-handle_info({route_xmlstreamelement, El}, StateName, StateData) ->
+handle_info({route_xmlstreamelement, El}, _StateName, StateData) ->
     {next_state, NStateName, NStateData, _Timeout} =
 	session_established({xmlstreamelement, El}, StateData),
     fsm_next_state(NStateName, NStateData);

src/translate.erl

@@ -81,7 +81,7 @@ load_file(Lang, File) ->
             io:setopts(Fd, [{encoding,latin1}]),
             load_file_loop(Fd, 1, File, Lang),
             file:close(Fd);
-        Error ->
+        {error, Error} ->
             ExitText = iolist_to_binary([File, ": ",
                                          file:format_error(Error)]),
             ?ERROR_MSG("Problem loading translation file ~n~s",