mytharchivehelper: Remove the cleanup guard

For some reason the cleanup guard was causing random segfaults in
MythSystemSignalManager . Removing it and deleting gContext just before exit()
is called seems to have fixed it.

Author: Paul Harrison

mythplugins/mytharchive/mytharchivehelper/main.cpp

@@ -2652,11 +2652,13 @@ int main(int argc, char **argv)
     // Don't listen to console input
     close(0);
 
-    CleanupGuard callCleanup(cleanup);
+    //CleanupGuard callCleanup(cleanup);
     gContext = new MythContext(MYTH_BINARY_VERSION);
     if (!gContext->Init(false))
     {
         LOG(VB_GENERAL, LOG_ERR, "Failed to init MythContext, exiting.");
+        delete gContext;
+        gContext = NULL;
         return GENERIC_EXIT_NO_MYTHCONTEXT;
     }
 
@@ -2815,6 +2817,9 @@ int main(int argc, char **argv)
     else
         cmdline.PrintHelp();
 
+    delete gContext;
+    gContext = NULL;
+
     exit(res);
 }