[gimp] app: remove unused variable in gimp_tile_handler_validate_command()

[Michael Natterer <mitch src gnome org>]

commit cad72b1432a536e366c9a010d0d77c596ed9c910
Author: Michael Natterer <mitch gimp org>
Date:   Mon Apr 2 23:23:54 2018 +0200

    app: remove unused variable in gimp_tile_handler_validate_command()

 app/gegl/gimptilehandlervalidate.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/app/gegl/gimptilehandlervalidate.c b/app/gegl/gimptilehandlervalidate.c
index 7e40ab3..ecf1ceb 100644
--- a/app/gegl/gimptilehandlervalidate.c
+++ b/app/gegl/gimptilehandlervalidate.c
@@ -313,8 +313,7 @@ gimp_tile_handler_validate_command (GeglTileSource  *source,
                                     gint             z,
                                     gpointer         data)
 {
-  GimpTileHandlerValidate *validate = GIMP_TILE_HANDLER_VALIDATE (source);
-  gpointer                 retval;
+  gpointer retval;
 
   retval = gegl_tile_handler_source_command (source, command, x, y, z, data);