[gimp] app: fix definition signature of gimp_scratch_get_total()

[Ell <ell src gnome org>]

commit 5d1a79a34f7e0c5efeb3672a3df24283c39b31af
Author: Ell <ell_se yahoo com>
Date:   Sat Dec 1 05:57:25 2018 -0500

    app: fix definition signature of gimp_scratch_get_total()

 app/core/gimp-scratch.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/app/core/gimp-scratch.c b/app/core/gimp-scratch.c
index 75fe302951..9f4ec2c1ca 100644
--- a/app/core/gimp-scratch.c
+++ b/app/core/gimp-scratch.c
@@ -93,7 +93,7 @@ gimp_scratch_context_free (GimpScratchContext *context)
 /*   public functions (stats)  */
 
 
-gsize
+guint64
 gimp_scratch_get_total (void)
 {
   return gimp_scratch_total;