qapi.py: Reject invalid characters in schema file

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 1374939721-7876-6-git-send-email-armbru@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/scripts/qapi.py b/scripts/qapi.py
index 342d16c..0b48a1e 100644
--- a/scripts/qapi.py
+++ b/scripts/qapi.py
@@ -101,6 +101,8 @@
                 if self.cursor == len(self.src):
                     self.tok = None
                     return
+            elif not self.tok.isspace():
+                raise QAPISchemaError(self, 'Stray "%s"' % self.tok)
 
     def get_members(self):
         expr = OrderedDict()