stand/ofw: dev can't be NULL here

[imp]

Summary

dev can't be NULL here. ofw_common_parsedev is always called via
devparse (indirectly through dv_parsedev() calls there which call it
with the args unchanged). In the past, ofw_getdev could call us with
NULL pointer for the parse-only case, but that's now all handled inside
of devparse for simplicity.

Sponsored by: Netflix

[tsoome]

stand/libofw/devicename.c

111

default_parsedev() is actually testing it too.

[imp]

Good eye.