[libxml2] fix: xmlXPathParserContext could be double-delete in OOM case.

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 74263eff5f6212afa2196022ecd2fbc39c6d3c36
Author: jinsub ahn <jinniahn gmail com>
Date:   Wed Mar 30 06:02:31 2022 +0000

    fix: xmlXPathParserContext could be double-delete in  OOM case.

 xpath.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/xpath.c b/xpath.c
index 0953373a..0b31bc07 100644
--- a/xpath.c
+++ b/xpath.c
@@ -13858,7 +13858,7 @@ xmlXPathRunEval(xmlXPathParserContextPtr ctxt, int toBool)
                         xmlMalloc(10 * sizeof(xmlXPathObjectPtr));
        if (ctxt->valueTab == NULL) {
            xmlXPathPErrMemory(ctxt, "creating evaluation context\n");
-           xmlFree(ctxt);
+           return(-1);
        }
        ctxt->valueNr = 0;
        ctxt->valueMax = 10;