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ip/ppp: fix %.*s format in debug print

--- a/sys/src/cmd/ip/ppp/ppp.c

+++ b/sys/src/cmd/ip/ppp/ppp.c

@@ -2269,7 +2269,7 @@

 		&& ppp->chap->proto == APpasswd

 		&& m->id <= ppp-> chap->id){

 			netlog("ppp: pap failed (%d:%.*s)\n",

-				m->data[0], m->data[0], (char*)m->data+1);

+				m->data[0], utfnlen((char*)m->data+1, m->data[0]), (char*)m->data+1);

 			terminate(ppp, 0);

 		}

 		break;