Remove dead code in xfrin.c

Remove dead code in xfrin.c

also removed unnecessary 'msg != NULL' check

   *** CID 352815:  Control flow issues  (DEADCODE) /lib/dns/xfrin.c: 1363 in xfrin_send_request()
   1357     	isc_nmhandle_attach(send_xfr->handle, &xfr->sendhandle);
   1358     	isc_refcount_increment0(&send_xfr->sends);
   1359     	isc_nm_send(xfr->handle, &region, xfrin_send_done, send_xfr);
   1360
   1361     failure:
   1362     	if (qname != NULL) {
   >>>     CID 352815:  Control flow issues  (DEADCODE)
   >>>     Execution cannot reach this statement: "dns_message_puttempname(msg...".
   1363     		dns_message_puttempname(msg, &qname);
   1364     	}
   1365     	if (qrdataset != NULL) {
   1366     		dns_message_puttemprdataset(msg, &qrdataset);
   1367     	}
   1368     	if (msg != NULL) {

   *** CID 352819:  Control flow issues  (DEADCODE) /lib/dns/xfrin.c: 1366 in xfrin_send_request()
   1360
   1361     failure:
   1362     	if (qname != NULL) {
   1363     		dns_message_puttempname(msg, &qname);
   1364     	}
   1365     	if (qrdataset != NULL) {
   >>>     CID 352819:  Control flow issues  (DEADCODE)
   >>>     Execution cannot reach this statement: "dns_message_puttemprdataset...".
   1366     		dns_message_puttemprdataset(msg, &qrdataset);
   1367     	}
   1368     	if (msg != NULL) {
   1369     		dns_message_detach(&msg);
   1370     	}
   1371     	if (soatuple != NULL) {