[gimp/gimp-2-8] plug-ins: use standard error on failed file descriptor in file-pdf-save.

[Jehan Pagès <jehanp src gnome org>]

commit 71bf6c46f18f3c038afa5b58b59977de34b2ea53
Author: Jehan <jehan girinstud io>
Date:   Tue Jul 29 16:55:01 2014 +0000

    plug-ins: use standard error on failed file descriptor in file-pdf-save.
    
    The standard message used all over our code is:
    "Could not open '%s' for writing: %s".
    (cherry picked from commit 4ae597c586f309d5268ef39ceac5a5adafd329e7)

 plug-ins/common/file-pdf-save.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/plug-ins/common/file-pdf-save.c b/plug-ins/common/file-pdf-save.c
index c792fae..8144e8b 100644
--- a/plug-ins/common/file-pdf-save.c
+++ b/plug-ins/common/file-pdf-save.c
@@ -102,6 +102,8 @@
 
 #include "config.h"
 
+#include <errno.h>
+
 #include <glib/gstdio.h>
 #include <cairo-pdf.h>
 #include <pango/pangocairo.h>
@@ -426,7 +428,17 @@ run (const gchar      *name,
   fp = g_fopen (file_name, "wb");
   if (fp == NULL)
     {
+      *nreturn_vals = 2;
+
       values[0].data.d_status = GIMP_PDB_EXECUTION_ERROR;
+      values[1].type          = GIMP_PDB_STRING;
+      if (error == NULL)
+        {
+          g_set_error (&error, G_FILE_ERROR, g_file_error_from_errno (errno),
+                       _("Could not open '%s' for writing: %s"),
+                       gimp_filename_to_utf8 (file_name), g_strerror (errno));
+        }
+      values[1].data.d_string = error->message;
       return;
     }