state: mtd_get_meminfo: open path readonly instead of readwrite

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

common/state.c

@@ -900,7 +900,7 @@ static int mtd_get_meminfo(const char *path, struct mtd_info_user *meminfo)
 {
 	int fd, ret;
 
-	fd = open(path, O_RDWR);
+	fd = open(path, O_RDONLY);
 	if (fd < 0)
 		return fd;