nfsd: use exp_put() for svc_export_cache put

This patch replaces cache_put() call for svc_export_cache by exp_put() call.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index 99ea4c0..c20a405 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -1205,7 +1205,7 @@
 	cache_get(&exp->h);
 	if (cache_check(&svc_export_cache, &exp->h, NULL))
 		return 0;
-	cache_put(&exp->h, &svc_export_cache);
+	exp_put(exp);
 	return svc_export_show(m, &svc_export_cache, cp);
 }