Upgrade libxml2 to dea91c97debeac7c1aaf9c19f79029809e23a353

Test: make
Change-Id: I47310362fafa74cddabc07d3be7adf2059f2264d
diff --git a/xpath.c b/xpath.c
index 7497ba0..1aa2f1a 100644
--- a/xpath.c
+++ b/xpath.c
@@ -10983,7 +10983,7 @@
     }
 
     if (xpctxt != NULL)
-        xpctxt->depth -= 1;
+        xpctxt->depth -= 10;
 }
 
 /**