Allow ref_transaction_free(NULL) as a no-op. This makes ref_transaction_free
easier to use and more similar to plain 'free'.

In particular, it lets us rollback unconditionally as part of cleanup code
after setting 'transaction = NULL' if a transaction has been committed or
rolled back already.

Reviewed-by: Jonathan Nieder <jrnie...@gmail.com>
Signed-off-by: Ronnie Sahlberg <sahlb...@google.com>
---
 refs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/refs.c b/refs.c
index a767ef6..0faed29 100644
--- a/refs.c
+++ b/refs.c
@@ -3312,6 +3312,9 @@ void ref_transaction_free(struct ref_transaction 
*transaction)
 {
        int i;
 
+       if (!transaction)
+               return;
+
        for (i = 0; i < transaction->nr; i++)
                free(transaction->updates[i]);
 
-- 
2.0.0.282.g3799eda.dirty

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