parser: Upgrade XML_IO_NETWORK_ATTEMPT to error

Fixes XML::LibXML test suite.

parserInternals.c

@@ -219,19 +219,20 @@ xmlCtxtErrIO(xmlParserCtxtPtr ctxt, int code, const char *uri)
     if (ctxt == NULL)
         return;
 
-    /*
-     * Only report a warning if a file could not be found. This should
-     * only be done for external entities, but the external entity loader
-     * of xsltproc can try multiple paths and assumes that ENOENT doesn't
-     * raise an error and aborts parsing.
-     */
     if (((code == XML_IO_ENOENT) ||
-         (code == XML_IO_NETWORK_ATTEMPT) ||
          (code == XML_IO_UNKNOWN))) {
+        /*
+         * Only report a warning if a file could not be found. This should
+         * only be done for external entities, but the external entity loader
+         * of xsltproc can try multiple paths and assumes that ENOENT doesn't
+         * raise an error and aborts parsing.
+         */
         if (ctxt->validate == 0)
             level = XML_ERR_WARNING;
         else
             level = XML_ERR_ERROR;
+    } else if (code == XML_IO_NETWORK_ATTEMPT) {
+        level = XML_ERR_ERROR;
     } else {
         level = XML_ERR_FATAL;
     }

python/tests/input_callback.py

@@ -99,7 +99,7 @@ def my_ctx_error_cb(arg, msg, severity, reserved):
 run_test(desc="Loading entity with custom callback",
         docpath=startURL, catalog=None,
         exp_status="loaded", exp_err=[
-            (  3, 'failed to load "http://example.com/dtds/sample.dtd": Attempt to load network entity\n'),
+            (  4, 'failed to load "http://example.com/dtds/sample.dtd": Attempt to load network entity\n'),
             (  4, "Entity 'sample.entity' not defined\n")
             ])