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ndb/dns: use nil for pointers in dnresolve() args

--- a/sys/src/cmd/ndb/dns.c

+++ b/sys/src/cmd/ndb/dns.c

@@ -771,11 +771,11 @@

 /*

  * dnsdebug calls

- *	rr = dnresolve(buf, Cin, type, &req, 0, 0, Recurse, rooted, 0);

+ *	rr = dnresolve(buf, Cin, type, &req, nil, 0, Recurse, rooted, nil);

  * which generates a UDP query, which eventually calls

  *	dnserver(&reqmsg, &repmsg, &req, buf, rcode);

  * which calls

- *	rp = dnresolve(name, Cin, type, req, &mp->an, 0, recurse, 1, 0);

+ *	rp = dnresolve(name, Cin, type, req, &mp->an, 0, recurse, 1, nil);

  *

  * but here we just call dnresolve directly.

  */

@@ -787,7 +787,7 @@

 	RR *rp, *neg;

 	status = Rok;

-	rp = dnresolve(p, Cin, mf->type, req, 0, 0, Recurse, rooted, &status);

+	rp = dnresolve(p, Cin, mf->type, req, nil, 0, Recurse, rooted, &status);

 	neg = rrremneg(&rp);

 	if(neg){

--- a/sys/src/cmd/ndb/dnsdebug.c

+++ b/sys/src/cmd/ndb/dnsdebug.c

@@ -349,10 +349,10 @@

 		memset(&req, 0, sizeof req);

 		req.isslave = 1;

 		req.aborttime = NS2MS(nowns) + Maxreqtm;

-		*l = dnresolve(rp->host->name, Cin, Ta, &req, 0, 0, Recurse, 0, 0);

+		*l = dnresolve(rp->host->name, Cin, Ta, &req, nil, 0, Recurse, 0, nil);

 		if(*l == nil)

 			*l = dnresolve(rp->host->name, Cin, Taaaa, &req,

-				0, 0, Recurse, 0, 0);

+				nil, 0, Recurse, 0, nil);

 		while(*l != nil)

 			l = &(*l)->next;

 	}

@@ -436,7 +436,7 @@

 	getactivity(&req, 0);

 	req.isslave = 1;

 	req.aborttime = NS2MS(nowns) + Maxreqtm;

-	rr = dnresolve(buf, Cin, type, &req, 0, 0, Recurse, rooted, 0);

+	rr = dnresolve(buf, Cin, type, &req, nil, 0, Recurse, rooted, nil);

 	if(rr){

 		print("----------------------------\n");

 		for(rp = rr; rp; rp = rp->next)

--- a/sys/src/cmd/ndb/dnserver.c

+++ b/sys/src/cmd/ndb/dnserver.c

@@ -171,7 +171,7 @@

 	name = mp->qd->owner->name;

 	type = mp->qd->type;

-	rp = dnresolve(name, Cin, type, req, &mp->an, 0, recurse, 1, 0);

+	rp = dnresolve(name, Cin, type, req, &mp->an, 0, recurse, 1, nil);

 	/* don't return soa hints as answers, it's wrong */

 	if(rp && rp->db && !rp->auth && rp->type == Tsoa) {

--- a/sys/src/cmd/ndb/dnsgetip.c

+++ b/sys/src/cmd/ndb/dnsgetip.c

@@ -38,7 +38,7 @@

 	req.isslave = 1;

 	req.aborttime = NS2MS(nowns) + Maxreqtm;

-	rr = dnresolve(name, Cin, type, &req, 0, 0, Recurse, 0, &status);

+	rr = dnresolve(name, Cin, type, &req, nil, 0, Recurse, 0, &status);

 	neg = rrremneg(&rr);

 	if(rr == nil || neg != nil){

 		if(neg != nil)