Upgrade libxml2 to c41bc10da31a4a4e5416270110b6d1b79606cad1

Test: make
Change-Id: Ic025f2f5cd8dbadc8bf3a446b941c403931de3f1
diff --git a/xpath.c b/xpath.c
index 1aa2f1a..11b452e 100644
--- a/xpath.c
+++ b/xpath.c
@@ -11120,7 +11120,9 @@
 	    name = NULL;
 	    if (CUR != ')') {
 		name = xmlXPathParseLiteral(ctxt);
-		CHECK_ERROR NULL;
+                if (name == NULL) {
+	            XP_ERRORNULL(XPATH_EXPR_ERROR);
+                }
 		*test = NODE_TEST_PI;
 		SKIP_BLANKS;
 	    }
@@ -14730,5 +14732,3 @@
 }
 
 #endif /* LIBXML_XPATH_ENABLED */
-#define bottom_xpath
-#include "elfgcchack.h"