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ftpfs: dont convert names to latin when string is valid utf-8

--- a/sys/src/cmd/ip/ftpfs/proto.c

+++ b/sys/src/cmd/ip/ftpfs/proto.c

@@ -1517,14 +1517,17 @@

 {

 	char *p, *to;

 	Rune r;

+	int n;

 	if(os == Plan9)

 		return nil;

 	/* don't convert if we don't have to */

-	for(p = from; *p; p++)

-		if(*p & 0x80)

+	for(p = from; *p; p += n){

+		n = chartorune(&r, p);

+		if(r == Runeerror)

 			break;

+	}

 	if(*p == 0)

 		return nil;