chop one label off the left side of a dname. so
wwww.nlnetlabs.nl, becomes nlnetlabs.nl
This new name is a clone and must be freed with ldns_deep_free()
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d: the dname to chop
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Returns the remaining dname
ldns_dname_label_count()
count the number of labels inside a LDNS_RDF_DNAME type rdf.
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*r: the rdf
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Returns the number of labels
AUTHOR
The ldns team at NLnet Labs. Which consists out of
Jelte Jansen and Miek Gieben.