odb: allow asking for the size alonecmn/read-only-size

Reading a packed object's type can be expensive if it's deeply
chained. Allow a caller to skip that part of the lookup if they don't
care or know the type through other means.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/odb.c b/src/odb.c
index 890e6e2f8..0c8cf84f0 100644
--- a/src/odb.c
+++ b/src/odb.c
@@ -900,11 +900,12 @@ int git_odb__read_header_or_object(
 	int error = GIT_ENOTFOUND;
 	git_odb_object *object;
 
-	assert(db && id && out && len_p && type_p);
+	assert(db && id && out && len_p);
 
 	if ((object = git_cache_get_raw(odb_cache(db), id)) != NULL) {
 		*len_p = object->cached.size;
-		*type_p = object->cached.type;
+		if (type_p)
+			*type_p = object->cached.type;
 		*out = object;
 		return 0;
 	}