#247 tau_uri2Addr() NULL check for pDNR

[Siddhi Wadgaonkar]

In tau_dnr.c, in the function tau_uri2Addr() ; while assigning the value to pDNR, it is assumed that the DNR is already initialized.

pDNR = (TAU_DNR_DATA_T *) appHandle->pUser;

Proposing to add a NULL check before looking into the cache, as per the attached diff.
If found NULL, TRDP_UNRESOLVED_ERR should be returned.

Same proposal also for tau_addr2Uri() function.

[Bernd Löhr]

Thank you, you're correct. Please add the checks...

[Siddhi Wadgaonkar]

Committed. r1860