Author: Reinhard Tartler <siretart@tauware.de>
Subject: Fix segfault when called with a null pointer

Index: libxi-1.6.1/src/XIQueryDevice.c
===================================================================
--- libxi-1.6.1.orig/src/XIQueryDevice.c	2011-12-20 01:28:44.000000000 +0100
+++ libxi-1.6.1/src/XIQueryDevice.c	2012-12-11 13:16:33.328167000 +0100
@@ -114,6 +114,10 @@
 XIFreeDeviceInfo(XIDeviceInfo* info)
 {
     XIDeviceInfo *ptr = info;
+
+    if (!ptr)
+        return;
+
     while(ptr->name)
     {
         Xfree(ptr->classes);