mtd: rawnand: Propagate error and simplify ternary operators for brcmstb_nand_wait_for_completion()

As bcmnand_ctrl_poll_status() return negative errno, so return true if
sts < 0. The < 0 case does not exist for wait_for_completion_timeout(),
so return true if sts = 0 and zero otherwise. Both of the true return
of them can be considered as a -ETIMEDOUT err, so return -ETIMEDOUT
if err is true to propagate err from its caller.

Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com>
Reviewed-by: William Zhang <william.zhang@broadcom.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20230808032943.3890545-1-ruanjinjie@huawei.com

Author: Ruan Jinjie

drivers/mtd/nand/raw/brcmnand/brcmnand.c

@@ -1666,13 +1666,13 @@ static bool brcmstb_nand_wait_for_completion(struct nand_chip *chip)
 		disable_ctrl_irqs(ctrl);
 		sts = bcmnand_ctrl_poll_status(ctrl, NAND_CTRL_RDY,
 					       NAND_CTRL_RDY, 0);
-		err = (sts < 0) ? true : false;
+		err = sts < 0;
 	} else {
 		unsigned long timeo = msecs_to_jiffies(
 						NAND_POLL_STATUS_TIMEOUT_MS);
 		/* wait for completion interrupt */
 		sts = wait_for_completion_timeout(&ctrl->done, timeo);
-		err = (sts <= 0) ? true : false;
+		err = !sts;
 	}
 
 	return err;
@@ -1688,6 +1688,7 @@ static int brcmnand_waitfunc(struct nand_chip *chip)
 	if (ctrl->cmd_pending)
 		err = brcmstb_nand_wait_for_completion(chip);
 
+	ctrl->cmd_pending = 0;
 	if (err) {
 		u32 cmd = brcmnand_read_reg(ctrl, BRCMNAND_CMD_START)
 					>> brcmnand_cmd_shift(ctrl);
@@ -1696,8 +1697,8 @@ static int brcmnand_waitfunc(struct nand_chip *chip)
 			"timeout waiting for command %#02x\n", cmd);
 		dev_err_ratelimited(ctrl->dev, "intfc status %08x\n",
 			brcmnand_read_reg(ctrl, BRCMNAND_INTFC_STATUS));
+		return -ETIMEDOUT;
 	}
-	ctrl->cmd_pending = 0;
 	return brcmnand_read_reg(ctrl, BRCMNAND_INTFC_STATUS) &
 				 INTFC_FLASH_STATUS;
 }