[gimp] libgimpbase: don't leak GPConfig::icon_theme_dir

[Ell <ell src gnome org>]

commit 9afa42ab9134757169247fbee762cd8545d2ceaf
Author: Ell <ell_se yahoo com>
Date:   Mon Nov 19 16:31:04 2018 -0500

    libgimpbase: don't leak GPConfig::icon_theme_dir

 libgimpbase/gimpprotocol.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/libgimpbase/gimpprotocol.c b/libgimpbase/gimpprotocol.c
index c4aaa59b36..27068c9fe4 100644
--- a/libgimpbase/gimpprotocol.c
+++ b/libgimpbase/gimpprotocol.c
@@ -640,6 +640,7 @@ _gp_config_destroy (GimpWireMessage *msg)
       g_free (config->app_name);
       g_free (config->wm_class);
       g_free (config->display_name);
+      g_free (config->icon_theme_dir);
       g_slice_free (GPConfig, config);
     }
 }