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ext4srv: revisit "fix meta csum producing garbage" in a better way

The entry's inode wasn't set *before* calculating the checksum.
There is no reason to clear the whole block.

--- a/sys/src/cmd/ext4srv/ext4_dir_idx.c

+++ b/sys/src/cmd/ext4srv/ext4_dir_idx.c

@@ -380,10 +380,10 @@

 	/* Fill the whole block with empty entry */

 	struct ext4_dir_en *be = (void *)new_block.data;

+	ext4_dir_en_set_inode(be, 0);

 	if (ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_METADATA_CSUM)) {

 		int len = block_size - sizeof(struct ext4_dir_entry_tail);

-		memset(be, 0, len);

 		ext4_dir_en_set_entry_len(be, len);

 		ext4_dir_en_set_name_len(sb, be, 0);

 		ext4_dir_en_set_inode_type(sb, be, EXT4_DE_UNKNOWN);

@@ -392,8 +392,6 @@

 	} else {

 		ext4_dir_en_set_entry_len(be, block_size);

 	}

-

-	ext4_dir_en_set_inode(be, 0);

 	ext4_trans_set_block_dirty(new_block.buf);

 	rc = ext4_block_set(dir->fs->bdev, &new_block);