Merge branch 'zh/read-cache-copy-name-entry-fix'

Remove redundant copying (with index v3 and older) or possible
over-reading beyond end of mmapped memory (with index v4) has been
corrected.

* zh/read-cache-copy-name-entry-fix:
  read-cache.c: reduce unnecessary cache entry name copying

read-cache.c

@@ -1944,8 +1944,6 @@ static struct cache_entry *create_from_disk(struct mem_pool *ce_mem_pool,
 	ce->ce_namelen = len;
 	ce->index = 0;
 	oidread(&ce->oid, ondisk->data);
-	memcpy(ce->name, name, len);
-	ce->name[len] = '\0';
 
 	if (expand_name_field) {
 		if (copy_len)