clr-boot-manager
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clearlinux
fail when probing root fs with btrfs
When the root fs is a btrfs volume c-b-m will fail to probe it.
cbm_probe_path() will call cbm_devnode_to_devpath(), there we assert the major number and assume it should be greater than 0, but in the case of btrfs the major will be always 0 (due its pseudo-fs nature). We must implement an alternate case when we realize we're dealing with btrfs.
