[libxml2] Initialize XPath floating-point globals

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 0e9776b070524c14513915c2af4c57608f1b7a74
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Sun Apr 3 17:09:50 2022 +0200

    Initialize XPath floating-point globals
    
    Should fix #138.

 xpath.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/xpath.c b/xpath.c
index 0b31bc07..26e9d967 100644
--- a/xpath.c
+++ b/xpath.c
@@ -475,9 +475,9 @@ int wrap_cmp( xmlNodePtr x, xmlNodePtr y );
  *                                                                     *
  ************************************************************************/
 
-double xmlXPathNAN;
-double xmlXPathPINF;
-double xmlXPathNINF;
+double xmlXPathNAN = 0.0;
+double xmlXPathPINF = 0.0;
+double xmlXPathNINF = 0.0;
 
 /**
  * xmlXPathInit: