nss_dns: Validate RDATA length against packet length [BZ #19830]
In _nss_dns_getcanonname_r, a check for the availability of RR metadata was missing as well. (cherry picked from commit f749498f)
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In _nss_dns_getcanonname_r, a check for the availability of RR metadata was missing as well. (cherry picked from commit f749498f)