zbb 792baee6b7 Fix VNIC enumeration after r294993 and r294990
ofw_bus_get_node() must be tested against negative values since
missing parent bus method will result in calling the default method
which simply returns (-1): sys/dev/ofw/ofw_bus_if.m
This was lost in the review process.

Obtained from: Semihalf
Sponsored by:  Cavium
2016-01-28 16:58:49 +00:00
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