lix/main: return the legacy command statuses

This was forgotten which should have been part of 64b9247f.

Change-Id: I3cf83d8699f2c1963ce530bbea6a511075202a79
Signed-off-by: Raito Bezarius <raito@lix.systems>

lix/nix/main.cc

@@ -493,8 +493,7 @@ int mainWrapped(AsyncIoRoot & aio, int argc, char ** argv)
         registerLegacyCommands();
         auto legacy = (*LegacyCommandRegistry::commands)[programName];
         if (legacy) {
-            legacy(aio, std::string(baseNameOf(argv[0])), Strings(argv + 1, argv + argc));
-            return 0;
+            return legacy(aio, std::string(baseNameOf(argv[0])), Strings(argv + 1, argv + argc));
         }
     }