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ip/pppoe: fix %.*s format in debug prints

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

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

@@ -614,10 +614,10 @@

 			fprint(2, "end of tag list\n");

 			break;

 		case TagSrvName:

-			fprint(2, "service '%.*s'\n", len, (char*)v);

+			fprint(2, "service '%.*s'\n", utfnlen((char*)v, len), (char*)v);

 			break;

 		case TagAcName:

-			fprint(2, "ac '%.*s'\n", len, (char*)v);

+			fprint(2, "ac '%.*s'\n", utfnlen((char*)v, len), (char*)v);

 			break;

 		case TagHostUniq:

 			fprint(2, "nonce ");

@@ -636,10 +636,10 @@

 			fprint(2, "relay ");

 			goto Hex;

 		case TagSrvNameErr:

-			fprint(2, "srverr '%.*s'\n", len, (char*)v);

+			fprint(2, "srverr '%.*s'\n", utfnlen((char*)v, len), (char*)v);

 			break;

 		case TagAcSysErr:

-			fprint(2, "syserr '%.*s'\n", len, (char*)v);

+			fprint(2, "syserr '%.*s'\n", utfnlen((char*)v, len), (char*)v);

 			break;

 		}

 		sz += 2+2+len;