mfd: sm501: Switch to BIT() to mitigate integer overflows

If offset end up being high enough, right hand expression in functions
like sm501_gpio_set() shifted left for that number of bits, may
not fit in int type.

Just in case, fix that by using BIT() both as an option safe from
overflow issues and to make this step look similar to other gpio
drivers.

Found by Linux Verification Center (linuxtesting.org) with static
analysis tool SVACE.

Fixes: f61be27 ("sm501: add gpiolib support")
Signed-off-by: Nikita Zhandarovich <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lee Jones <[email protected]>

Author: Nikita Zhandarovich

drivers/mfd/sm501.c

@@ -920,7 +920,7 @@ static void sm501_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 {
 	struct sm501_gpio_chip *smchip = gpiochip_get_data(chip);
 	struct sm501_gpio *smgpio = smchip->ourgpio;
-	unsigned long bit = 1 << offset;
+	unsigned long bit = BIT(offset);
 	void __iomem *regs = smchip->regbase;
 	unsigned long save;
 	unsigned long val;
@@ -946,7 +946,7 @@ static int sm501_gpio_input(struct gpio_chip *chip, unsigned offset)
 	struct sm501_gpio_chip *smchip = gpiochip_get_data(chip);
 	struct sm501_gpio *smgpio = smchip->ourgpio;
 	void __iomem *regs = smchip->regbase;
-	unsigned long bit = 1 << offset;
+	unsigned long bit = BIT(offset);
 	unsigned long save;
 	unsigned long ddr;
 
@@ -971,7 +971,7 @@ static int sm501_gpio_output(struct gpio_chip *chip,
 {
 	struct sm501_gpio_chip *smchip = gpiochip_get_data(chip);
 	struct sm501_gpio *smgpio = smchip->ourgpio;
-	unsigned long bit = 1 << offset;
+	unsigned long bit = BIT(offset);
 	void __iomem *regs = smchip->regbase;
 	unsigned long save;
 	unsigned long val;