timezone: Fix an uninitialized use
GTK ci rightly complains about this when ti builds GLib as a subproject with -Werror=maybe-uninitialized.
subkey_dynamic_w will be freed without being initialized when the first goto is taken.
GTK ci rightly complains about this when ti builds GLib as a subproject with -Werror=maybe-uninitialized.
subkey_dynamic_w will be freed without being initialized when the first goto is taken.