[MTD] Only call mtd->sync() method in mtdchar close if opened for write.

Signed-off-by: NJoakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: NDavid Woodhouse <dwmw2@infradead.org>

drivers/mtd/mtdchar.c

@@ -135,7 +135,8 @@ static int mtd_close(struct inode *inode, struct file *file)
 
 	DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
 
-	if (mtd->sync)
+	/* Only sync if opened RW */
+	if ((file->f_mode & 2) && mtd->sync)
 		mtd->sync(mtd);
 
 	put_mtd_device(mtd);