[gegl] watershed-transform: s/_context_get_source/_context_dup_object/

[Øyvind Kolås <ok src gnome org>]

commit 38ebf166e02202cf42cd75060c45e2f6e303871a
Author: Øyvind Kolås <pippin gimp org>
Date:   Tue Nov 21 21:37:10 2017 +0100

    watershed-transform: s/_context_get_source/_context_dup_object/

 operations/common/watershed-transform.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/operations/common/watershed-transform.c b/operations/common/watershed-transform.c
index 83400f0..fbd2e05 100644
--- a/operations/common/watershed-transform.c
+++ b/operations/common/watershed-transform.c
@@ -339,7 +339,7 @@ operation_process (GeglOperation        *operation,
   GeglBuffer     *output;
   gboolean        success;
 
-  aux = gegl_operation_context_get_source (context, "aux");
+  aux = (GeglBuffer*) gegl_operation_context_dup_object (context, "aux");
 
   if (!aux)
     {
@@ -347,7 +347,7 @@ operation_process (GeglOperation        *operation,
     }
   else
     {
-      input = gegl_operation_context_get_source (context, "input");
+      input = (GeglBuffer*) gegl_operation_context_dup_object (context, "input");
       output = gegl_operation_context_get_target (context, "output");
 
       success = process (operation, input, aux, output, result, level);