[gnumeric] css: plug leak.

[Morten Welinder <mortenw src gnome org>]

commit 416f2702c6d999d0b14a28bc105dacd30e6a0fe1
Author: Morten Welinder <terra gnome org>
Date:   Sun Dec 26 19:14:12 2021 -0500

    css: plug leak.

 src/wbc-gtk.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/wbc-gtk.c b/src/wbc-gtk.c
index 6f83c6481..01acb1dd0 100644
--- a/src/wbc-gtk.c
+++ b/src/wbc-gtk.c
@@ -2419,6 +2419,8 @@ cb_screen_changed (GtkWidget *widget)
                                             (gpointer)"1");
                csstext = gnm_cpp (g_bytes_get_data (cssbytes, NULL), vars);
 
+               g_hash_table_destroy (vars);
+
                data = g_new (struct css_provider_data, 1);
                data->css = gtk_css_provider_new ();
                data->screens = NULL;