In cgetmatch(3), return -1 if a NULL or 0-length name parameter is used.

This situation most notably arises in chkprintcap, when a /etc/printcap
entry has an empty rp= attribute. In that case, cgetmatch would enter
an infinite loop if any entry in the file has multiple names.

This causes lpd to hang at boot time on 5.0-DP2 when both conditions
are met (:rp=: and multiple names -- not necessarily on the same entry).

Reviewed by:	roberto

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