Re: [PATCH] Don't dereference NULL upon lookup_tree failure.

When running on an x86_64 system (either debian unstable or rawhide)
I see only this:

  0 blocks
  error: Object 0d57588da39d10795486bd5451bc2660832228e6 is a commit, not a tree
  fatal: The remote end hung up unexpectedly
...

diff --git a/object.c b/object.c
index 16793d9..eb59550 100644
--- a/object.c
+++ b/object.c

@@ -142,10 +142,14 @@ struct object *parse_object_buffer(const unsigned char *sha1, enum object_type t
 		obj = &blob->object;
 	} else if (type == OBJ_TREE) {
 		struct tree *tree = lookup_tree(sha1);
-		obj = &tree->object;
-		if (!tree->object.parsed) {
-			parse_tree_buffer(tree, buffer, size);
-			eaten = 1;
+		if (!tree)
+		    obj = NULL;
+		else {
+		    obj = &tree->object;
+		    if (!tree->object.parsed) {
+			    parse_tree_buffer(tree, buffer, size);
+			    eaten = 1;
+		    }
 		}
 	} else if (type == OBJ_COMMIT) {
 		struct commit *commit = lookup_commit(sha1);