[eog-plugins] exif-display: Correctly NULL-ify all pointers to the histogram data

[Felix Riemann <friemann src gnome org>]

commit 146580e8cb8bc41da11ee727238fab3ce6d29f30
Author: Felix Riemann <friemann gnome org>
Date:   Sat May 26 22:31:27 2012 +0200

    exif-display: Correctly NULL-ify all pointers to the histogram data
    
    Fixes double-frees when skipping through images quickly.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=676735

 plugins/exif-display/eog-exif-display-plugin.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/plugins/exif-display/eog-exif-display-plugin.c b/plugins/exif-display/eog-exif-display-plugin.c
index c313053..884f484 100644
--- a/plugins/exif-display/eog-exif-display-plugin.c
+++ b/plugins/exif-display/eog-exif-display-plugin.c
@@ -304,8 +304,13 @@ calculate_histogram (EogExifDisplayPlugin *plugin, EogImage *eog_image)
 	plugin->histogram_values_red = NULL;
 
 	g_free (plugin->histogram_values_green);
+	plugin->histogram_values_green = NULL;
+
 	g_free (plugin->histogram_values_blue);
+	plugin->histogram_values_blue = NULL;
+
 	g_free (plugin->histogram_values_rgb);
+	plugin->histogram_values_rgb = NULL;
 
 	image_pixbuf = eog_image_get_pixbuf (eog_image);
 	if (image_pixbuf == NULL) {