xbmc-pvr: add upstream patch

Signed-off-by: Stephan Raue <stephan@openelec.tv>

packages/mediacenter/xbmc-pvr/patches/xbmc-pvr-84817e6-9993-dont_deref_null_pointers.patch

@@ -0,0 +1,20 @@
+commit bee67c6b7129a6764c964a93e35e33b7cf2b35ea
+Author: spiff <spiff@xbmc.org>
+Date:   Wed Jan 18 16:33:47 2012 +0100
+
+    fixed: don't deref null pointers, not even in release builds
+
+diff --git a/xbmc/addons/AddonInstaller.cpp b/xbmc/addons/AddonInstaller.cpp
+index dc5c366..a7d96c0 100644
+--- a/xbmc/addons/AddonInstaller.cpp
++++ b/xbmc/addons/AddonInstaller.cpp
+@@ -262,6 +262,9 @@ void CAddonInstaller::InstallFromXBMCRepo(const set<CStdString> &addonIDs)
+ bool CAddonInstaller::CheckDependencies(const AddonPtr &addon)
+ {
+   assert(addon.get());
++  if (!addon)
++    return false;
++
+   ADDONDEPS deps = addon->GetDeps();
+   CAddonDatabase database;
+   database.Open();