Use glib for all allocations

- Removes need to check for malloc failure
- Removes need for NULL checks on free
- Adds checks for integer overflows
- Removes some extra memset calls
- Removes chance of mixing libc and glib malloc/free

src/fe-gtk/sexy-spell-entry.c

@@ -292,7 +292,7 @@ insert_hiddenchar (SexySpellEntry *entry, guint start, guint end)
 	 * is 'hidden' */
 #if 0
 	PangoAttribute *hattr;
-	PangoRectangle *rect = g_malloc (sizeof (PangoRectangle));
+	PangoRectangle *rect = g_new (PangoRectangle, 1);
 
 	rect->x = 0;
 	rect->y = 0;