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vt: fix %.*s in sendncars()

--- a/sys/src/cmd/vt/main.c

+++ b/sys/src/cmd/vt/main.c

@@ -213,6 +213,8 @@

 void

 sendnchars(int n, char *p)

 {

+	if((n = utfnlen(p, n)) < 1)

+		return;

 	hostin = smprint("%.*s", n, p);

 	while(hostin != nil){

 		if(nbsendp(hc[0], hostin)){