[gimp] plug-ins: fix film to succeed again and not always do nothing

[Michael Natterer <mitch src gnome org>]

commit 7a9517c261828e2e5665c700a7f91117d19d0c5b
Author: Michael Natterer <mitch gimp org>
Date:   Sun Sep 8 15:51:51 2019 +0200

    plug-ins: fix film to succeed again and not always do nothing

 plug-ins/common/film.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)
---
diff --git a/plug-ins/common/film.c b/plug-ins/common/film.c
index 05ccf5c290..8bfdf2cfab 100644
--- a/plug-ins/common/film.c
+++ b/plug-ins/common/film.c
@@ -1356,11 +1356,12 @@ film_dialog (GimpImage *image)
                               -1);
 
           if ((image_id >= 0) && (num_images < MAX_FILM_PICTURES))
-            filmvals.images = g_list_append (filmvals.images,
-                                             gimp_image_get_by_id (image_id));
+            {
+              filmvals.images = g_list_append (filmvals.images,
+                                               gimp_image_get_by_id (image_id));
+              filmvals.num_images++;
+            }
         }
-
-      filmvals.num_images = num_images;
     }
 
   gtk_widget_destroy (dlg);