Removed last dependency on the obsolete enum xmlSchemaValidError.

* xmlschemas.c: Removed last dependency on the obsolete enum
  xmlSchemaValidError.
diff --git a/xmlschemas.c b/xmlschemas.c
index 7d936af..459bcde 100644
--- a/xmlschemas.c
+++ b/xmlschemas.c
@@ -581,7 +581,7 @@
     void *errCtxt;             /* user specific error context */    
     xmlSchemaValidityErrorFunc error;   /* the callback in case of errors */
     xmlSchemaValidityWarningFunc warning;       /* the callback in case of warning */
-    xmlSchemaValidError err;
+    int err;
     int nberrors;
     xmlStructuredErrorFunc serror;