gweather: Fix build warning wrt g_autoptr() usage

libgweather/gweather-location.c: In function ‘gweather_location_common_deserialize’:
libgweather/gweather-location.c:1591:5: warning: passing argument 1 of ‘glib_autoptr_cleanup_GWeatherLocation’ from incompatible pointer type [-Wincompatible-pointer-types]
 1591 |     g_autoptr(GWeatherLocation) *by_station_code = NULL;
      |     ^~~~~~~~~
      |     |
      |     GWeatherLocation *** {aka struct _GWeatherLocation ***}
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Status Job ID Name Coverage
  Test
passed #1082935
build-fedora

00:03:01