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cwfs: fix %.*s format in cmd_printconf()

--- a/sys/src/cmd/cwfs/config.c

+++ b/sys/src/cmd/cwfs/config.c

@@ -529,11 +529,11 @@

 		if(*p++ != '\n')

 			continue;

 		if (strncmp(s, "ip", 2) != 0)	/* don't print obsolete cmds */

-			print("%.*s", (int)(p-s), s);

+			print("%.*s", utfnlen(s, p-s), s);

 		s = p;

 	}

 	if(p != s)

-		print("%.*s", (int)(p-s), s);

+		print("%.*s", utfnlen(s, p-s), s);

 	print("end\n");

 	putbuf(iob);

-- 

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