Slightly modified version of the former 003 Fedora patch, in order to fix gentoo bug 396127

diff -up xsane-0.997/src/xsane-back-gtk.c.no-file-selected xsane-0.997/src/xsane-back-gtk.c
--- xsane-0.997/src/xsane-back-gtk.c.no-file-selected	2002-10-02 13:05:52.000000000 +0200
+++ xsane-0.997/src/xsane-back-gtk.c	2010-07-13 10:02:09.468118791 +0200
@@ -1111,6 +1111,11 @@ static void xsane_back_gtk_filetype2_cal
 
   chooser_filename = gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(filechooser));
 
+  if (!chooser_filename)
+  {
+    return;
+  }
+
   if ((new_filetype) && (*new_filetype))
   {
     extension = strrchr(chooser_filename, '.');
@@ -1501,12 +1506,19 @@ int xsane_back_gtk_get_filename(const ch
 #endif
 
     chooser_filename = gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(filechooser));
-    strncpy(filename, chooser_filename, max_len - 1);
-    g_free(chooser_filename);
+    if (chooser_filename)
+    {
+      strncpy(filename, chooser_filename, max_len - 1);
+      g_free(chooser_filename);
 
-    filename[max_len - 1] = '\0';
+      filename[max_len - 1] = '\0';
 
-    ok = TRUE;
+      ok = TRUE;
+    }
+    else
+    {
+      ok = FALSE;
+    }
   }
 
   gtk_widget_destroy(filechooser);
diff -up xsane-0.997/src/xsane-front-gtk.c.no-file-selected xsane-0.997/src/xsane-front-gtk.c
--- xsane-0.997/src/xsane-front-gtk.c.no-file-selected	2002-10-02 13:04:33.000000000 +0200
+++ xsane-0.997/src/xsane-front-gtk.c	2010-07-13 09:59:31.005868940 +0200
@@ -1339,7 +1339,11 @@ static void xsane_browse_filename_callba
   snprintf(windowname, sizeof(windowname), "%s %s %s", xsane.prog_name, WINDOW_OUTPUT_FILENAME, xsane.device_text);
 
   umask((mode_t) preferences.directory_umask); /* define new file permissions */    
-  xsane_back_gtk_get_filename(windowname, filename, sizeof(filename), filename, &preferences.filetype, &preferences.cms_function, XSANE_FILE_CHOOSER_ACTION_SELECT_SAVE, show_extra_widgets, XSANE_FILE_FILTER_ALL | XSANE_FILE_FILTER_IMAGES, XSANE_FILE_FILTER_IMAGES);
+  if (xsane_back_gtk_get_filename(windowname, filename, sizeof(filename), filename, &preferences.filetype, &preferences.cms_function, XSANE_FILE_CHOOSER_ACTION_SELECT_SAVE, show_extra_widgets, XSANE_FILE_FILTER_ALL | XSANE_FILE_FILTER_IMAGES, XSANE_FILE_FILTER_IMAGES) < 0)
+  {
+    xsane_set_sensitivity(TRUE);
+    return;
+  }
   umask(XSANE_DEFAULT_UMASK); /* define new file permissions */    
 
   if (preferences.filename)