transport-helper.c: do not translate a string twice

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

transport-helper.c

@@ -573,7 +573,7 @@ static int run_connect(struct transport *transport, struct strbuf *cmdbuf)
 			fprintf(stderr, "Debug: Falling back to dumb "
 				"transport.\n");
 	} else {
-		die(_(_("unknown response to connect: %s")),
+		die(_("unknown response to connect: %s"),
 		    cmdbuf->buf);
 	}