ext2: Simplify error handling of IO error when adding xattr

When we fail to write out inode when adding new xattr block, we backed
out some changes (like quota modifications) but left others (like block
allocation or inode xattr block modification). Just leave the inode
intact in this case because we can hardly reach a consistent state and
defer fixing to e2fsck. Also remove outdated comment and special data
handling since sync_inode_metadata() does not write out any data.

Link: https://patch.msgid.link/20260728154724.3934977-2-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>

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