refs.c: allow passing NULL to ref_transaction_free

diff --git a/refs.c b/refs.c
index 21ed46534ab81aa966860a8eaad6e499d9e2b2c3..1d6dece4266226b3a3b6f44a0afc006ac39151c4 100644 (file)
--- a/refs.c
+++ b/refs.c
@@ -3338,6 +3338,9 @@ void ref_transaction_free(struct ref_transaction *transaction)
 {
        int i;
 
+       if (!transaction)
+               return;
+
        for (i = 0; i < transaction->nr; i++)
                free(transaction->updates[i]);