tempfile: handle NULL tempfile pointers gracefully

diff --git a/merge.c b/merge.c
index 04ee5fc911c8d8134decb5c1a400576ae5681bf6..1d441ad94254257ad2ac28b8a17dc0b8e5ce14f9 100644 (file)
--- a/merge.c
+++ b/merge.c
@@ -44,8 +44,8 @@ int try_merge_command(const char *strategy, size_t xopts_nr,
        return ret;
 }
 
-int checkout_fast_forward(const unsigned char *head,
-                         const unsigned char *remote,
+int checkout_fast_forward(const struct object_id *head,
+                         const struct object_id *remote,
                          int overwrite_ignore)
 {
        struct tree *trees[MAX_UNPACK_TREES];