[gobject-introspection] repository: Ensure error is set if we're parsing a malformed file

[Colin Walters <walters src gnome org>]

commit 4fbb34bb0ea4a1d142052e62a29480c704550f8b
Author: Jean BrÃfort <jean brefort normalesup org>
Date:   Fri Feb 17 11:48:35 2012 -0500

    repository: Ensure error is set if we're parsing a malformed file
    
    https://bugzilla.gnome.org/show_bug.cgi?id=661951

 girepository/girparser.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)
---
diff --git a/girepository/girparser.c b/girepository/girparser.c
index 041c65d..fa0de1f 100644
--- a/girepository/girparser.c
+++ b/girepository/girparser.c
@@ -3511,10 +3511,11 @@ _g_ir_parser_parse_string (GIrParser           *parser,
   if (ctx.modules)
     return ctx.modules->data;
 
-  g_set_error (error,
-               G_MARKUP_ERROR,
-               G_MARKUP_ERROR_INVALID_CONTENT,
-               "Expected namespace element in the gir file");
+  if (error && *error == NULL)
+    g_set_error (error,
+                 G_MARKUP_ERROR,
+                 G_MARKUP_ERROR_INVALID_CONTENT,
+                 "Expected namespace element in the gir file");
   return NULL;
 }