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hgfs: fix %.*s usage in walk

--- a/sys/src/cmd/hgfs/fs.c

+++ b/sys/src/cmd/hgfs/fs.c

@@ -499,13 +499,13 @@

 			if(nd == nil){

 				if(sname == name){

 					sname = strrchr(name, '.');

-					if((i = sname - name) > 0){

+					if(sname && (i = utfnlen(name, sname - name)) > 0){

+						snprint(buf, sizeof(buf), "%.*s", i, name);

 						sname++;

 						if(strncmp(sname, "rev", 3) == 0){

 							level = Qtreerev;

 							sname += 3;

 						}

-						snprint(buf, sizeof(buf), "%.*s", i, name);

 						if(*sname == 0)

 							i = 0;

 						else {