in rtlabel_name2id, handle the case of an empty name: return 0

label id 0 means "no label".
in pf_ioctl, where this is used to filter based on a label, this is an error
condition.
for the other 2 cases, messages on the routing socket, this allows for an
sockaddr_rtlabel to be always present for messages on the routing socket,
and when it is all zero it is exactly like if there was no sockaddr_rtlabel
at all.
ryan ok

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