We generally want to avoid lookup_unknown_object, because it
results in allocating more memory for the object than may be
strictly necessary.

In this case, it is used to check whether we have an
already-parsed object before calling parse_object, to save
us from reading the object from disk. Using lookup_object
would be fine for that purpose, but we can take it a step
further. Since this code was written, parse_object already
learned the "check lookup_object" optimization, so we can
simply call parse_object directly.

Signed-off-by: Jeff King <p...@peff.net>
 builtin/diff-tree.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/builtin/diff-tree.c b/builtin/diff-tree.c
index ce0e019..1c4ad62 100644
--- a/builtin/diff-tree.c
+++ b/builtin/diff-tree.c
@@ -68,9 +68,7 @@ static int diff_tree_stdin(char *line)
        line[len-1] = 0;
        if (get_sha1_hex(line, sha1))
                return -1;
-       obj = lookup_unknown_object(sha1);
-       if (!obj || !obj->parsed)
-               obj = parse_object(sha1);
+       obj = parse_object(sha1);
        if (!obj)
                return -1;
        if (obj->type == OBJ_COMMIT)
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