[libvirt] [PATCH] Fix error in secret.rng schema.

[Diego Elio 'Flameeyes' Pettenò]

With this error the schema is not a well-formed XML file.
---
 docs/schemas/secret.rng |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/docs/schemas/secret.rng b/docs/schemas/secret.rng
index 40e2b7f..39f8625 100644
--- a/docs/schemas/secret.rng
+++ b/docs/schemas/secret.rng
@@ -36,7 +36,7 @@
         <optional>
           <element name='usage'>
             <choice>
-              <ref name='usagevolume'>
+              <ref name='usagevolume' />
               <!-- More choices later -->
             </choice>
           </element>
-- 
1.6.5.5