[gimp] Revert "app: make GimpTileHandlerValidate thread safe"

[N/A <ell src gnome org>]

commit eeddd13209ff32a47c6471946267e406a3c88e1f
Author: Ell <ell_se yahoo com>
Date:   Fri Nov 24 14:07:29 2017 -0500

    Revert "app: make GimpTileHandlerValidate thread safe"
    
    This reverts commit 4bd118ec8ad857c8bab54ff9118937dd24d0a8e9.
    
    The mutex introduced by the above commit should no longer be
    necessary, after GEGL commit
    8b034c437b0162b26f85eb80867914977ac3cf57.

 app/gegl/gimptilehandlervalidate.c |   10 +---------
 app/gegl/gimptilehandlervalidate.h |    1 -
 2 files changed, 1 insertions(+), 10 deletions(-)
---
diff --git a/app/gegl/gimptilehandlervalidate.c b/app/gegl/gimptilehandlervalidate.c
index 71b91a7..c7feab1 100644
--- a/app/gegl/gimptilehandlervalidate.c
+++ b/app/gegl/gimptilehandlervalidate.c
@@ -106,7 +106,6 @@ gimp_tile_handler_validate_init (GimpTileHandlerValidate *validate)
 
   source->command = gimp_tile_handler_validate_command;
 
-  g_mutex_init (&validate->mutex);
   validate->dirty_region = cairo_region_create ();
 }
 
@@ -117,7 +116,6 @@ gimp_tile_handler_validate_finalize (GObject *object)
 
   g_clear_object (&validate->graph);
   g_clear_pointer (&validate->dirty_region, cairo_region_destroy);
-  g_mutex_clear (&validate->mutex);
 
   G_OBJECT_CLASS (parent_class)->finalize (object);
 }
@@ -323,13 +321,7 @@ gimp_tile_handler_validate_command (GeglTileSource  *source,
   retval = gegl_tile_handler_source_command (source, command, x, y, z, data);
 
   if (command == GEGL_TILE_GET && z == 0)
-    {
-      g_mutex_lock (&validate->mutex);
-
-      retval = gimp_tile_handler_validate_validate (source, retval, x, y);
-
-      g_mutex_unlock (&validate->mutex);
-    }
+    retval = gimp_tile_handler_validate_validate (source, retval, x, y);
 
   return retval;
 }
diff --git a/app/gegl/gimptilehandlervalidate.h b/app/gegl/gimptilehandlervalidate.h
index 542deed..5e2bda8 100644
--- a/app/gegl/gimptilehandlervalidate.h
+++ b/app/gegl/gimptilehandlervalidate.h
@@ -42,7 +42,6 @@ struct _GimpTileHandlerValidate
 {
   GeglTileHandler  parent_instance;
 
-  GMutex           mutex;
   GeglNode        *graph;
   cairo_region_t  *dirty_region;
   const Babl      *format;