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snoopy: ... and fix the memory leak for new dns rr types

--- a/sys/src/cmd/ip/snoopy/dns.c

+++ b/sys/src/cmd/ip/snoopy/dns.c

@@ -488,6 +488,7 @@

 		memset(rp->srv, 0, sizeof *rp->srv);	/* cause trouble */

 		free(rp->srv);

 		break;

+	case Tdnskey:

 	case Tkey:

 		free(rp->key->data);

 		memset(rp->key, 0, sizeof *rp->key);	/* cause trouble */

@@ -508,9 +509,12 @@

 		memset(rp->null, 0, sizeof *rp->null);	/* cause trouble */

 		free(rp->null);

 		break;

+	case Tcaa:

+		free(rp->caa->data);

+		memset(rp->caa, 0, sizeof *rp->caa);	/* cause trouble */

+		break;

 	case Ttxt:

-		while(rp->txt != nil){

-			t = rp->txt;

+		while(t = rp->txt){

 			rp->txt = t->next;

 			free(t->p);

 			memset(t, 0, sizeof *t);	/* cause trouble */