[gimp] file-png: Return correct type of error value

[Mukund Sivaraman <muks src gnome org>]

commit ff2b9ee727586b431e17f283825be3444b5ef496
Author: Mukund Sivaraman <muks banu com>
Date:   Wed Sep 21 17:16:54 2011 +0530

    file-png: Return correct type of error value

 plug-ins/common/file-png.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/plug-ins/common/file-png.c b/plug-ins/common/file-png.c
index 7cfa1d5..6f50eb6 100644
--- a/plug-ins/common/file-png.c
+++ b/plug-ins/common/file-png.c
@@ -725,7 +725,7 @@ load_image (const gchar  *filename,
       g_set_error (error, 0, 0,
                    _("Error creating PNG read struct while saving '%s'."),
                    gimp_filename_to_utf8 (filename));
-      return FALSE;
+      return -1;
     }
 
   info = png_create_info_struct (pp);