ext4: cleanup the dax handling in ext4_fill_super
Only call fs_dax_get_by_bdev once the sbi has been allocated and remove the need for the dax_dev local variable. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Link: https://lore.kernel.org/r/20211129102203.2243509-21-hch@lst.de Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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