lib-smtp: client: Make smtp_client_transaction_unref(NULL) a no-op.

diff --git a/src/lib-smtp/smtp-client-transaction.c b/src/lib-smtp/smtp-client-transaction.c
index bd683e85277eaff1ec46af76a51ba0250783a586..28e457170ddd861fce6823ca5137b4253ae582d9 100644 (file)
--- a/src/lib-smtp/smtp-client-transaction.c
+++ b/src/lib-smtp/smtp-client-transaction.c
@@ -405,6 +405,9 @@ void smtp_client_transaction_unref(struct smtp_client_transaction **_trans)
 
        *_trans = NULL;
 
+       if (trans == NULL)
+               return;
+
        i_assert(trans->refcount > 0);
        if (--trans->refcount > 0)
                return;