fixup??? object-file.c: use size_t for header lengths

Header renaming bonanza.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

object-file.h

@@ -223,7 +223,7 @@ int finalize_object_file_flags(const char *tmpfile, const char *filename,
 			       enum finalize_object_file_flags flags);
 
 void hash_object_file(const struct git_hash_algo *algo, const void *buf,
-		      unsigned long len, enum object_type type,
+		      size_t len, enum object_type type,
 		      struct object_id *oid);
 
 /* Helper to check and "touch" a file */