om_utils_get_parent_path_from_uri adds extraneous slash at the end of returned path

function om_utils_get_parent_path_from_uri() from src/om-utils.c contains a call to

    parent_path = g_strconcat (tmp, "/", NULL);

thus, it will always return a path with an extra slash at the end.

Now, I dont know what is the reason for this, maybe it is needed somewhere, but this behavior breaks optimization in function
om_get_folder_listing() from obex-method.c : this function checks if we already have folder listing in our cache with the following if

   if (path && conn->current_dir && strcmp (path, conn->current_dir) == 0 && conn->current_listing != NULL )
      {
      // return already cached listing
      }

The problem is that often, variable 'path' has been filled up by a call to om_utils_get_parent_path_from_uri(),
and 'conn->current_dir' has been filled up by a call to om_utils_get_path_from_uri(). Or the other way around.

The first function adds extraneous slash, the second doesnt, thus check 'strcmp(path,conn->current_dir)==0' often fails even though
the paths are really the same, for example '/' and '//', or '/C:' and '/C:/'.