edid: Fix di_info leak after we are done parsing

This was only affecting builds using libdisplay-info.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3888>

src/backends/edid-parse.c

@@ -244,6 +244,8 @@ decode_edid_info (const uint8_t *edid,
       decode_edid_extensions (extensions[ext_index], info);
     }
 
+  di_info_destroy (edid_info);
+
   return TRUE;
 }