[gnome-software] trivial: Fix a theoretical crash spotted by clang

[Richard Hughes <rhughes src gnome org>]

commit 82f29082b308e840459b33f4f52790cacd725c2c
Author: Richard Hughes <richard hughsie com>
Date:   Mon Oct 28 16:28:02 2013 +0000

    trivial: Fix a theoretical crash spotted by clang

 src/plugins/gs-plugin-packagekit-history.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/plugins/gs-plugin-packagekit-history.c b/src/plugins/gs-plugin-packagekit-history.c
index 7c5092d..2717a92 100644
--- a/src/plugins/gs-plugin-packagekit-history.c
+++ b/src/plugins/gs-plugin-packagekit-history.c
@@ -160,7 +160,7 @@ gs_plugin_packagekit_refine (GsPlugin *plugin,
        GsApp *app_dummy;
        guint i = 0;
        GVariantIter iter;
-       GVariant *result;
+       GVariant *result = NULL;
        GVariant *tuple = NULL;
        GVariant *value;