QAsuite044 on devfs

[ASANO Masahiro <masano@xxxxxxxxxxxxxx>]

Hi,

A "kernel NULL pointer dereference" occurred at devfs_open() when I
executed QA suite 044 on my box with devfs. It handled an inode whose
i_bdev was NULL.
blkdev_put() had been changed to call bdput() from its inside at
Linux-2.4.10, but it seems that linvfs_release_buftarg() dose not cope
with it.

If I can be of further assistance, please let me know.
--
masano