add_missing_dev() can return device pointer so that IS_ERR/PTR_ERR can
be used to check for the actual error that occurred in the function.
Signed-off-by: NAnand Jain <anand.jain@oracle.com>
Reviewed-by: NLiu Bo <bo.li.liu@oracle.com>
[ minor error message adjustment ]
Signed-off-by: NDavid Sterba <dsterba@suse.com>