Improper return value handling in dns_adb_findaddrinfo (lib/dns/adb.c) can lead to SEGV

[Brian Conry]

Under low memory conditions new_adbaddrinfo() can return NULL, but
dns_adb_findaddrinfo was returning ISC_R_SUCCESS in that condition,
which indicates that the addrp should contain a valid pointer, but it
can not.

This has been observed to cause a SEGV core dump during testing.

I've attached a patch to return ISC_R_NOMEMORY.

Thanks,
Brian
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