mtd: rawnand: remove misguided comment of nand_get_device()

After commit 8cba3234 ("mtd: rawnand: protect access to rawnand devices
while in suspend"), it will wait while in suspend rather than returning
errors. So remove the misguided comment about return value.
Signed-off-by: ChenXiaoSong <chenxiaosong2@huawei.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220819021846.2924539-1-chenxiaosong2@huawei.com

drivers/mtd/nand/raw/nand_base.c

@@ -335,8 +335,6 @@ static int nand_isbad_bbm(struct nand_chip *chip, loff_t ofs)
  * @chip: NAND chip structure
  *
  * Lock the device and its controller for exclusive access
- *
- * Return: -EBUSY if the chip has been suspended, 0 otherwise
  */
 static void nand_get_device(struct nand_chip *chip)
 {