Added pthread_mutex_destroy() call.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@7600 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/exp-drd/tests/recursive_mutex.c b/exp-drd/tests/recursive_mutex.c
index eab2eec..e5b5854 100644
--- a/exp-drd/tests/recursive_mutex.c
+++ b/exp-drd/tests/recursive_mutex.c
@@ -27,6 +27,7 @@
 
     printf("Recursive mutex (statically initialized).\n");
     lock_twice(&m);
+    pthread_mutex_destroy(&m);
   } 
   {
     pthread_mutex_t m;