bdi: Initialize noop_backing_dev_info properly
Properly initialize this backing dev info so that writeback code does not barf when getting to it e.g. via sb->s_bdi. Cc: stable@kernel.org Signed-off-by: NJan Kara <jack@suse.cz> Signed-off-by: NJens Axboe <jaxboe@fusionio.com>
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