dax: remove the last BUG_ON() from fs/dax.c
Don't take down the kernel if we get an invalid 'from' and 'length' argument pair. Just warn once and return an error. Signed-off-by: NRoss Zwisler <ross.zwisler@linux.intel.com> Reviewed-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NJan Kara <jack@suse.cz> Signed-off-by: NDave Chinner <david@fromorbit.com>
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