[gegl] operations/common: s/_context_get_source/_context_dup_object/

[Øyvind Kolås <ok src gnome org>]

commit 7ec742d8e345b41a4eb5adf277bf1ca183a1a591
Author: Øyvind Kolås <pippin gimp org>
Date:   Tue Nov 21 19:57:46 2017 +0100

    operations/common: s/_context_get_source/_context_dup_object/

 operations/common/dither.c      |    2 +-
 operations/common/exp-combine.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/operations/common/dither.c b/operations/common/dither.c
index 8b2ebe0..18d7921 100644
--- a/operations/common/dither.c
+++ b/operations/common/dither.c
@@ -575,7 +575,7 @@ operation_process (GeglOperation        *operation,
           return FALSE;
         }
 
-      input  = gegl_operation_context_get_source (context, "input");
+      input  = (GeglBuffer*) gegl_operation_context_dup_object (context, "input");
       output = gegl_operation_context_get_output_maybe_in_place (operation,
                                                                  context,
                                                                  input,
diff --git a/operations/common/exp-combine.c b/operations/common/exp-combine.c
index 85cf37b..181c1d1 100644
--- a/operations/common/exp-combine.c
+++ b/operations/common/exp-combine.c
@@ -926,7 +926,7 @@ gegl_expcombine_get_exposures (GeglOperation        *operation,
         }
 
       /* Add exposure to list */
-      buffer  = gegl_operation_context_get_source (context,
+      buffer = (GeglBuffer*)gegl_operation_context_dup_object (context,
                                                    gegl_pad_get_name (pad));
       if (!buffer)
           continue;