ocfs2: Drop pointless sync_mapping_buffers() calls

ocfs2: Drop pointless sync_mapping_buffers() calls

ocfs2 never calls mark_buffer_dirty_inode() and thus its metadata
buffers list is always empty. Drop the pointless sync_mapping_buffers()
calls.

CC: Joel Becker <jlbec@evilplan.org>
CC: Joseph Qi <joseph.qi@linux.alibaba.com>
CC: ocfs2-devel@lists.linux.dev
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20260326095354.16340-46-jack@suse.cz
Tested-by: syzbot@syzkaller.appspotmail.com
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>