change example code to do mrb_close()

I was hoping this would cause valgrind to complain less, but there is still
a lot of memory leaked (does mrb_close() actually free all of the managed
blocks?)  Anyway this helps somewhat and is good practice

1 files changed, 1 insertions, 0 deletions

diff --git a/test/driver.c b/test/driver.c
index afc93b10b..4651d75fc 100644
--- a/test/driver.c
+++ b/test/driver.c
@@ -55,6 +55,7 @@ main(void)
   else {
     /* no */
   }
+  mrb_close(mrb);
 
   return 0;
 }