__ocfs2_add_entry(), ocfs2_prepare_dir_for_insert(): namelen checks

namelen can't be zero; neither when it's coming from dentry name,
nor when dealing with orphans (in ocfs2_orphan_add() and
__ocfs2_prepare_orphan_dir()).  Rudiment of old ext2 pointless
check, long gone in ext2 itself...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/ocfs2/dir.c

@@ -1593,9 +1593,6 @@ int __ocfs2_add_entry(handle_t *handle,
 	struct buffer_head *insert_bh = lookup->dl_leaf_bh;
 	char *data_start = insert_bh->b_data;
 
-	if (!namelen)
-		return -EINVAL;
-
 	if (ocfs2_dir_indexed(dir)) {
 		struct buffer_head *bh;
 
@@ -4245,12 +4242,6 @@ int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb,
 	trace_ocfs2_prepare_dir_for_insert(
 		(unsigned long long)OCFS2_I(dir)->ip_blkno, namelen);
 
-	if (!namelen) {
-		ret = -EINVAL;
-		mlog_errno(ret);
-		goto out;
-	}
-
 	/*
 	 * Do this up front to reduce confusion.
 	 *