varnish plugin: fix build against pre varnish 5.2

Older Varnish versions don't know about VSM_Destroy()

diff --git a/src/varnish.c b/src/varnish.c
index 67c5bfd126d0f7fdc9d657ccb23c727d7819fe6a..69daa980c1ab1995925c1cce949c09d04794b0fe 100644 (file)
--- a/src/varnish.c
+++ b/src/varnish.c
@@ -1390,7 +1390,7 @@ static int varnish_read(user_data_t *ud) /* {{{ */
 #endif
 #if HAVE_VARNISH_V3 || HAVE_VARNISH_V4
   if (!ok) {
-    VSM_Destroy(&vd);
+    VSM_Delete(vd);
     ERROR("varnish plugin: Unable to open connection.");
     return -1;
   }
@@ -1403,7 +1403,7 @@ static int varnish_read(user_data_t *ud) /* {{{ */
 #endif
 #if HAVE_VARNISH_V3 || HAVE_VARNISH_V4
   if (!stats) {
-    VSM_Destroy(&vd);
+    VSM_Delete(vd);
     ERROR("varnish plugin: Unable to get statistics.");
     return -1;
   }