p7zip: Update CVE-2016-9296 patch URL.
From: Robert Luberda <robert@debian.org>
Date: Sat, 19 Nov 2016 08:48:08 +0100
Subject: Fix nullptr dereference (CVE-2016-9296)

Patch taken from https://sourceforge.net/p/p7zip/bugs/185/
This patch file taken from Debian's patch set for p7zip

Upstream-Status: Backport [https://sourceforge.net/p/p7zip/bugs/185/]
CVE: CVE-2016-9296

Signed-off-by: Virendra Thakur <virendra.thakur@kpit.com>

Index: p7zip_16.02/CPP/7zip/Archive/7z/7zIn.cpp
===================================================================
--- p7zip_16.02.orig/CPP/7zip/Archive/7z/7zIn.cpp
+++ p7zip_16.02/CPP/7zip/Archive/7z/7zIn.cpp
@@ -1097,7 +1097,8 @@ HRESULT CInArchive::ReadAndDecodePackedS
       if (CrcCalc(data, unpackSize) != folders.FolderCRCs.Vals[i])
         ThrowIncorrect();
   }
-  HeadersSize += folders.PackPositions[folders.NumPackStreams];
+  if (folders.PackPositions)
+      HeadersSize += folders.PackPositions[folders.NumPackStreams];
   return S_OK;
 }