hash: make `is_null_oid()` independent of `the_repository`

The function `is_null_oid()` uses `oideq(oid, null_oid())` to check
whether a given object ID is the all-zero object ID. `null_oid()`
implicitly relies on `the_repository` though to return the correct null
object ID.

Get rid of this dependency by always comparing the complete hash array
for being all-zeroes. This is possible due to the refactoring of object
IDs so that their hash arrays are always fully initialized.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 0 insertions, 5 deletions

diff --git a/hash.h b/hash.h
index ddc2e5ca47..84f2296cfb 100644
--- a/hash.h
+++ b/hash.h
@@ -6,11 +6,6 @@
 
 #define the_hash_algo the_repository->hash_algo
 
-static inline int is_null_oid(const struct object_id *oid)
-{
-	return oideq(oid, null_oid());
-}
-
 static inline int is_empty_blob_oid(const struct object_id *oid)
 {
 	return oideq(oid, the_hash_algo->empty_blob);