btrfs: use GFP_KERNEL in btrfs_init_dev_replace_tgtdev
The function is called from ioctl context and we don't hold any locks that take part in writeback. Right now it's only fs_info::volume_mutex. Reviewed-by: NAnand Jain <anand.jain@oracle.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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