Alexander Motin 1123f298f3 Fix panics on attempt to dereference uninitizlized pointer, returned via
'path' argument of ofw_parsedev() if devspec refers raw device with no path.

For example, `ls /pci@1f,0/ide@d/disk@0,0:a/` works fine, while
`ls /pci@1f,0/ide@d/disk@0,0:a` panicked before this change.
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