Created attachment 242432 [details] [review]
check if gicon is null before unref.

st_icon_set_icon_name check for gicon and priv->gicon equality then unref gicon. If both are null , it fails to unref.

else we could return if icon_name is null (which is the case here) as then gicon is always null (and g_themed_icon_new_with_default_fallbacks seems to always return a gicon if icon_name passed is not null).

+ Trace 231851