5c831ddec8
When /boot or friends is on btrfs RAID, btrfs_get_block_device_at() will succeed with 0 and provide zero devnum. Then, - if we are previleged, devname_from_devnum() maps the devnum to /run/systemd/inaccessible/blk, and the subsequent verification by blkid will fail, - if we are unprevileged, sd_device_new_from_devnum() will fail. This makes - when find_esp() or find_xbootldr() is called without any paths, that is, called with the searching mode, then returns -ENOKEY, which should be handled gracefully by the caller, - when they are called with an input path, then they provide the proper error message and suggestion. Fixes RHBZ#2251262 (https://bugzilla.redhat.com/show_bug.cgi?id=2251262).
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