Fix 'update' command output

So far, ejabberd_update:update/0 returned the return value of
release_handler_1:eval_script/1.  That function returns the list of
updated but unpurged modules, i.e., modules where one or more processes
are still running an old version of the code.  Since commit
5a34020d23, the ejabberd 'update' command
assumes that value to be the list of updated modules instead.  As
that seems more useful, modify ejabberd_update:update/0 accordingly.
This fixes the 'update' command output.

src/ejabberd_admin.erl

@@ -746,7 +746,7 @@ update_module(ModuleNameString) ->
     case ejabberd_update:update([ModuleName]) of
 	{ok, []} ->
             {ok, "Not updated: "++ModuleNameString};
-	{ok, [{ModuleName, _}]} ->
+	{ok, [ModuleName]} ->
             {ok, "Updated: "++ModuleNameString};
 	{error, Reason} -> {error, Reason}
     end.

src/ejabberd_update.erl

@@ -38,13 +38,17 @@
 %% Update all the modified modules
 update() ->
     case update_info() of
-	{ok, Dir, _UpdatedBeams, _Script, LowLevelScript, _Check} ->
-	    Eval =
-		eval_script(
+	{ok, Dir, UpdatedBeams, _Script, LowLevelScript, _Check} ->
+	    case eval_script(
 		   LowLevelScript, [],
-		  [{ejabberd, "", filename:join(Dir, "..")}]),
+		   [{ejabberd, "", filename:join(Dir, "..")}]) of
+		{ok, _} ->
+		    ?DEBUG("Updated: ~p~n", [UpdatedBeams]),
+		    {ok, UpdatedBeams};
+		Eval ->
 		    ?DEBUG("Eval: ~p~n", [Eval]),
-	    Eval;
+		    Eval
+	    end;
 	{error, Reason} ->
 	    {error, Reason}
     end.
@@ -56,12 +60,16 @@ update(ModulesToUpdate) ->
 	    UpdatedBeamsNow =
 		[A || A <- UpdatedBeamsAll, B <- ModulesToUpdate, A == B],
 	    {_, LowLevelScript, _} = build_script(Dir, UpdatedBeamsNow),
-	    Eval =
-		eval_script(
+	    case eval_script(
 		   LowLevelScript, [],
-		  [{ejabberd, "", filename:join(Dir, "..")}]),
+		   [{ejabberd, "", filename:join(Dir, "..")}]) of
+		{ok, _} ->
+		    ?DEBUG("Updated: ~p~n", [UpdatedBeamsNow]),
+		    {ok, UpdatedBeamsNow};
+		Eval ->
 		    ?DEBUG("Eval: ~p~n", [Eval]),
-	    Eval;
+		    Eval
+	    end;
 	{error, Reason} ->
 	    {error, Reason}
     end.