hash: require hash algorithm in oidread() and oidclr()

Both `oidread()` and `oidclr()` use `the_repository` to derive the hash
function that shall be used. Require callers to pass in the hash
algorithm to get rid of this implicit dependency.

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

builtin/fetch-pack.c

@@ -29,11 +29,11 @@ static void add_sought_entry(struct ref ***sought, int *nr, int *alloc,
 			; /* <oid>, leave oid as name */
 		} else {
 			/* <ref>, clear cruft from oid */
-			oidclr(&oid);
+			oidclr(&oid, the_repository->hash_algo);
 		}
 	} else {
 		/* <ref>, clear cruft from get_oid_hex */
-		oidclr(&oid);
+		oidclr(&oid, the_repository->hash_algo);
 	}
 
 	ref = alloc_ref(name);