weather applet prefs crash due to incorrect use of g_settings_get ()

[Marcus Comstedt]

The function compare_location() in gweather-pref.c contains the following call:

    g_settings_get (pref->priv->applet->lib_settings, "default-location", "(ssm(dd))",
      &default_loc, NULL, NULL);

This format string requires 5 pointers to be provided, but only 3 are given. Beacuse if this, g_settings_get will use random stack data as pointers, and corrupt memory causing a crash.

Adding 2 more NULL pointers fixes the problem:

    g_settings_get (pref->priv->applet->lib_settings, "default-location", "(ssm(dd))",
      &default_loc, NULL, NULL, NULL, NULL);

Version 3.5.92-0ubuntu1, quantal.